OCLC |
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OCLC, Inc., doing business as OCLC,[4] is an American nonprofit cooperative organization "dedicated to the public purposes of furthering access to the world's information and reducing information costs".[3] It was founded in 1967 as the Ohio College Library Center, then became the Online Computer Library Center as it expanded. In 2017, the name was formally changed to OCLC, Inc.[4] OCLC and its member libraries cooperatively produce and maintain WorldCat, the largest online public access catalog (OPAC) in the world.[5] OCLC is funded mainly by the fees that libraries pay (around $200 million annually in total as of 2016[update]) for the many different services it offers.[1] OCLC also maintains the Dewey Decimal Classification system.
History
OCLC began in 1967, as the Ohio College Library Center, through a collaboration of university presidents, vice presidents, and library directors who wanted to create a cooperative, computerized network for libraries in the state of Ohio. The group first met on July 5, 1967, on the campus of Ohio State University to sign the articles of incorporation for the nonprofit organization[6] and hired Frederick G. Kilgour, a former Yale University medical school librarian, to design the shared cataloging system.[7] Kilgour wished to merge the latest information storage and retrieval system of the time, the computer, with the oldest, the library. The plan was to merge the catalogs of Ohio libraries electronically through a computer network and database to streamline operations, control costs, and increase efficiency in library management, bringing libraries together to cooperatively keep track of the world's information in order to best serve researchers and scholars. The first library to do online cataloging through OCLC was the Alden Library at Ohio University on August 26, 1971. This was the first online cataloging by any library worldwide.[6]
Membership in OCLC is based on use of services and contribution of data. Between 1967 and 1977, OCLC membership was limited to institutions in Ohio, but in 1978, a new governance structure was established that allowed institutions from other states to join. In 2002, the governance structure was again modified to accommodate participation from outside the United States.[8]
As OCLC expanded services in the United States outside Ohio, it relied on establishing strategic partnerships with "networks", organizations that provided training, support and marketing services. By 2008, there were 15 independent United States regional service providers. OCLC networks played a key role in OCLC governance, with networks electing delegates to serve on the OCLC Members Council. During 2008, OCLC commissioned two studies to look at distribution channels; at the same time, the council approved governance changes that had been recommended by the Board of Trustees severing the tie between the networks and governance. In early 2009, OCLC negotiated new contracts with the former networks and opened a centralized support center.[9]
Services
OCLC provides bibliographic, abstract and full-text information to anyone.
OCLC and its member libraries cooperatively produce and maintain WorldCat—the OCLC Online Union Catalog, the largest online public access catalog (OPAC) in the world.[5] WorldCat has holding records from public and private libraries worldwide.
The Online Computer Library Center acquired the trademark and copyrights associated with the Dewey Decimal Classification System when it bought Forest Press in 1988. A browser[10] for books with their Dewey Decimal Classifications was available until July 2013; it was replaced by the Classify Service.
Until August 2009, when it was sold to Backstage Library Works, OCLC owned a preservation microfilm and digitization operation called the OCLC Preservation Service Center,[11] with its principal office in Bethlehem, Pennsylvania.
Starting in 1971, OCLC produced catalog cards for members alongside its shared online catalog; the company printed its last catalog cards on October 1, 2015.[12]
QuestionPoint
QuestionPoint,[13] an around-the-clock reference service provided to users by a cooperative of participating global libraries, was acquired by Springshare from OCLC in 2019 and migrated to Springshare's LibAnswers platform.[14][15]
Software
OCLC commercially sells software, such as:
- CONTENTdm for managing digital collections[16][17][18]
- Wise, an integrated library system and "community engagement system"[19][20]
- WorldCat Discovery, a bibliographic discovery system that allows library patrons to use a single search interface to access an institution's catalog, ebooks, database subscriptions and more[21][22]
- WorldShare Management Services, an electronic resource management system[23][22]
Research
OCLC has been conducting research for the library community for more than 30 years. In accordance with its mission, OCLC makes its research outcomes known through various publications.[24] These publications, including journal articles, reports, newsletters, and presentations, are available through the organization's website.
- OCLC Publications – Research articles from various journals including The Code4Lib Journal, OCLC Research, Reference and User Services Quarterly, College & Research Libraries News, Art Libraries Journal, and National Education Association Newsletter. The most recent publications are displayed first, and all archived resources, starting in 1970, are also available.[25]
- Membership Reports – A number of significant reports on topics ranging from virtual reference in libraries to perceptions about library funding.[26]
- Newsletters – Current and archived newsletters for the library and archive community.[27]
- Presentations – Presentations from both guest speakers and OCLC research from conferences, webcasts, and other events. The presentations are organized into five categories: Conference presentations, Dewey presentations, Distinguished Seminar Series, Guest presentations, and Research staff presentations.[28]
During the COVID-19 pandemic, OCLC participated in the REopening Archives, Libraries, and Museums (REALM) project funded by the IMLS to study the surface transmission risks of SARS-CoV-2 on common library and museum materials and surfaces,[29] and published a series of reports.[30]
Advocacy
Advocacy has been a part of OCLC's mission since its founding in 1967. OCLC staff members meet and work regularly with library leaders, information professionals, researchers, entrepreneurs, political leaders, trustees, students and patrons to advocate "advancing research, scholarship, education, community development, information access, and global cooperation".[31][32]
WebJunction, which provides training services to librarians,[33] is a division of OCLC funded by grants from the Bill & Melinda Gates Foundation beginning in 2003.[34][35]
OCLC partnered with search engine providers in 2003 to advocate for libraries and share information across the Internet landscape. Google, Yahoo!, and Ask.com all collaborated with OCLC to make WorldCat records searchable through those search engines.[31]
OCLC's advocacy campaign "Geek the Library", started in 2009, highlights the role of public libraries. The campaign, funded by a grant from the Bill & Melinda Gates Foundation, uses a strategy based on the findings of the 2008 OCLC report, "From Awareness to Funding: A study of library support in America".[36]
Other past advocacy campaigns have focused on sharing the knowledge gained from library and information research. Such projects have included communities such as the Society of American Archivists, the Open Archives Initiative, the Institute for Museum and Library Services, the International Organization for Standardization, the National Information Standards Organization, the World Wide Web Consortium, the Internet Engineering Task Force, and Internet2. One of the most successful contributions to this effort was the Dublin Core Metadata Initiative, "an open forum of libraries, archives, museums, technology organizations, and software companies who work together to develop interoperable online metadata standards that support a broad range of purposes and business models."[31]
OCLC has collaborated with the Wikimedia Foundation and the Wikimedia volunteer community, through integrating library metadata with Wikimedia projects, hosting a Wikipedian in residence, and doing a national training program through WebJunction called "Wikipedia + Libraries: Better Together".[37][38][39]
Online database: WorldCat
OCLC's WorldCat database is used by the general public and by librarians for cataloging and research. WorldCat is available to the public for searching via a subscription web-based service called FirstSearch,[40] as well as through the publicly available WorldCat.org.[41]
Identifiers and linked data
OCLC assigns a unique control number (referred to as an "OCN" for "OCLC Control Number") to each new bibliographic record in the WorldCat. Numbers are assigned serially, and as of mid-2013 over a billion OCNs had been created. In September 2013, the OCLC declared these numbers to be in the public domain, removing a perceived barrier to widespread use of OCNs outside OCLC itself.[42] The control numbers link WorldCat's records to local library system records by providing a common reference key for a record across libraries.[43]
OCNs are particularly useful as identifiers for books and other bibliographic materials that do not have ISBNs (e.g., books published before 1970). OCNs are used as identifiers often in Wikipedia and Wikidata. In October 2013, it was reported that out of 29,673 instances of book infoboxes in Wikipedia, "there were 23,304 ISBNs and 15,226 OCNs", and regarding Wikidata: "of around 14 million Wikidata items, 28,741 were books. 5403 Wikidata items have an ISBN associated with them, and 12,262 have OCNs."[44]
OCLC also runs the Virtual International Authority File (VIAF), an international name authority file, with oversight from the VIAF Council composed of representatives of institutions that contribute data to VIAF.[45] VIAF numbers are broadly used as standard identifiers, including in Wikipedia.[37][46]
Company acquisitions
OCLC acquired NetLibrary, a provider of electronic books and textbooks, in 2002 and sold it in 2010 to EBSCO Industries.[47] OCLC owns 100% of the shares of OCLC PICA, a library automation systems and services company which has its headquarters in Leiden in the Netherlands and which was renamed "OCLC" at the end of 2007.[48] In July 2006, the Research Libraries Group (RLG) merged with OCLC.[49][50]
On January 11, 2008, OCLC announced[51] that it had purchased EZproxy. It has also acquired OAIster. The process started in January 2009 and from October 31, 2009, OAIster records are freely available via WorldCat.org.
In 2013, OCLC acquired the Dutch library automation company HKA[52][53] and its integrated library system Wise,[20] which OCLC calls a "community engagement system" that "combines the power of customer relationship management, marketing, and analytics with ILS functions".[19] OCLC began offering Wise to libraries in the United States in 2019.[20]
In January 2015, OCLC acquired Sustainable Collection Services (SCS). SCS offered consulting services based on analyzing library print collection data to help libraries manage and share materials.[54] In 2017, OCLC acquired Relais International, a library interlibrary loan service provider based in Ottawa, Canada.[55]
A more complete list of mergers and acquisitions is available on the OCLC website.[56]
Criticism
In May 2008, OCLC was criticized by Jeffrey Beall for monopolistic practices, among other faults.[57] Library blogger Rick Mason responded that although he thought Beall had some "valid criticisms" of OCLC, he demurred from some of Beall's statements and warned readers to "beware the hyperbole and the personal nature of his criticism, for they strongly overshadow that which is worth stating".[58]
In November 2008, the Board of Directors of OCLC unilaterally issued a new Policy for Use and Transfer of WorldCat Records[59] that would have required member libraries to include an OCLC policy note on their bibliographic records; the policy caused an uproar among librarian bloggers.[60][61] Among those who protested the policy was the non-librarian activist Aaron Swartz, who believed the policy would threaten projects such as the Open Library, Zotero, and Wikipedia, and who started a petition to "Stop the OCLC powergrab".[62][63] Swartz's petition garnered 858 signatures, but the details of his proposed actions went largely unheeded.[61] Within a few months, the library community had forced OCLC to retract its policy and to create a Review Board to consult with member libraries more transparently.[61] In August 2012, OCLC recommended that member libraries adopt the Open Data Commons Attribution (ODC-BY) license when sharing library catalog data, although some member libraries have explicit agreements with OCLC that they can publish catalog data using the CC0 Public Domain Dedication.[64][65]
In July 2010, the company was sued by SkyRiver, a rival startup, in an antitrust suit.[66] Library automation company Innovative Interfaces joined SkyRiver in the suit.[67] The suit was dropped in March 2013, however, following the acquisition of SkyRiver by Innovative Interfaces.[68] Innovative Interfaces was later bought by ExLibris, therefore passing OCLC as the dominant supplier of ILS services in the USA (over 70% market share for academic libraries and over 50% for public libraries for ExLibris, versus OCLC's 10% market share of both types of libraries in 2019).[69]
See also
References
- ↑ 1.0 1.1
- ↑ 2.0 2.1 OCLC Consolidated Financial Statements 2015–16. OCLC, 12. September 2016, abgerufen am 28. Mai 2017.
- ↑ 3.0 3.1 About OCLC. OCLC, 25. März 2021, abgerufen am 19. Juni 2021 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ 4.0 4.1 Certificate of Amendment of the Amended Articles of Incorporation of OCLC Online Computer Library Center, Inc. Ohio Secretary of State, 26. Juni 2017, abgerufen am 18. August 2019.
- ↑ 5.0 5.1 Godfrey Oswald: Library world records. 3rd Auflage. McFarland & Company, Jefferson, NC 2017, ISBN 978-1-4766-6777-5, Largest unified international library catalog, S. 291 (google.com).
- ↑ 6.0 6.1 In the beginning. In: oclc.org. OCLC, abgerufen am 28. August 2012.
- ↑ Sheila Intner: The Passing of an Era. In: Technicalities. 27. Jahrgang, ISSN 0272-0884, S. 1–14.
- ↑
- ↑ Brenda Bailey-Hainer: The OCLC Network of Regional Service Providers: The Last 10 Years. In: Journal of Library Administration. 49. Jahrgang, Nr. 6, 19. Oktober 2009, ISSN 0193-0826, S. 621–629, doi:10.1080/01930820903238792.
- ↑ OCLC DeweyBrowser. In: deweybrowser.oclc.org. Archiviert vom am 25. Mai 2017; abgerufen am 28. Mai 2017.
- ↑ Preservation Service Center. OCLC, archiviert vom am 29. Dezember 2003 .
- ↑ OCLC prints last library catalog cards October 1, 2015. Abgerufen im May 28, 2015. (englisch)
- ↑ QuestionPoint. OCLC, archiviert vom am 15. Februar 2017; abgerufen am 28. Mai 2017 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ Jayne Gest: OCLC to sell QuestionPoint software to Florida company. In: Smart Business Dealmakers Columbus. 3. Juni 2019, abgerufen am 25. April 2020.
- ↑ Springshare Acquires QuestionPoint from OCLC. In: springshare.com. 31. Mai 2019, abgerufen am 25. April 2020.
- ↑ CONTENTdm. OCLC, abgerufen am 28. Mai 2017 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ Heather Gilbert, Tyler Mobley: Breaking up with CONTENTdm: why and how one institution took the leap to open source. In: The Code4Lib Journal. Nr. 20, 17. April 2013, ISSN 1940-5758 (code4lib.org).
- ↑ Amanda Mita, Zachary Pelli, Kimberly Reamer, Sharon Ince: CONTENTdm to Digital Commons: considerations and workflows. In: Journal of Archival Organization. 15. Jahrgang, Nr. 1–2, April 2018, S. 58–70, doi:10.1080/15332748.2019.1609308.
- ↑ 19.0 19.1 OCLC Wise: Community engagement system for public libraries. OCLC, abgerufen am 25. April 2020 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ 20.0 20.1 20.2 Ben Johnson: OCLC Wise Reimagines the ILS. In: infotoday.com. Information Today, 2. April 2019, abgerufen am 25. April 2020.
- ↑ WorldCat Discovery. OCLC, abgerufen am 11. März 2019 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ 22.0 22.1 Marshall Breeding: Discovery services: bundled or separate? 2. Januar 2019, abgerufen am 25. April 2020: „Should discovery services be bundled or acquired à la carte? Perspectives differ regarding the benefits of pairing a discovery service (for example, Ex Libris Primo or OCLC's WorldCat Discovery Service) with the resource management system from the same vendor (Ex Libris Alma or OCLC's WorldShare Management Services).“
- ↑ WorldShare Management Services: An advanced, cloud-based library services platform. OCLC, abgerufen am 25. April 2020 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ Shirley Hyatt, Jeffrey A. Young: OCLC Research Publications Repository. In: D-Lib Magazine. 11. Jahrgang, Nr. 3, 2005, doi:10.1045/march2005-hyatt.
- ↑ OCLC Publications. In: www.oclc.org. Abgerufen am 28. August 2012.
- ↑ OCLC Membership Reports. In: www.oclc.org. Abgerufen am 28. August 2012.
- ↑ OCLC Presentations. In: www.oclc.org. Abgerufen am 28. August 2012.
- ↑ Smith, Carrie (January 4, 2021). "REALM test results: how long SARS-CoV-2 lives on common library materials". American Libraries. Retrieved June 19, 2021.
- ↑ REALM project – Research. In: www.oclc.org. Abgerufen am 19. Juni 2021.
- ↑ 31.0 31.1 31.2 Cathy De Rosa: Advocacy and OCLC. In: Journal of Library Administration. 49. Jahrgang, Nr. 7, 22. Oktober 2009, ISSN 0193-0826, S. 719–726, doi:10.1080/01930820903260572.
- ↑ Wendy M. Grossman: Why you can't find a library book in your search engine In: The Guardian January 21, 2009. Abgerufen am 28. Mai 2017. (britisches Englisch)
- ↑ WebJunction. OCLC, abgerufen am 30. April 2014.
- ↑ Marylaine Block: Gates Foundation and OCLC announce WebJunction. In: infotoday.com. Information Today, 19. Mai 2003, abgerufen am 25. April 2020.
- ↑ Matt Enis: Grant to support OCLC WebJunction for five years. In: Library Journal. 7. September 2012, abgerufen am 25. April 2020.
- ↑ Advocacy: From Awareness to Funding, the next chapter. In: www.oclc.org. OCLC, 18. Juli 2018 .
- ↑ 37.0 37.1 Libraries Leverage Wikimedia. In: www.oclc.org. OCLC, abgerufen am 25. April 2020 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ Wikipedia + Libraries: Better Together. In: webjunction.org. Abgerufen am 25. April 2020.
- ↑ Wikipedia + Libraries: Better Together: OCLC WebJunction. In: archive.org. 22. August 2018, abgerufen am 25. April 2020. Training curriculum and support materials.
- ↑ FirstSearch: Precision searching of WorldCat. OCLC, abgerufen am 26. Juni 2019.
- ↑ Paula J. Hane: OCLC to open WorldCat searching to the world. In: infotoday.com. Information Today, 17. Juli 2006, abgerufen am 26. Juni 2019.
- ↑ Richard Wallis: OCLC Declare OCLC Control Numbers Public Domain. In: dataliberate.com. 24. September 2013 .
- ↑ OCLC Control Number. Abgerufen am 3. Januar 2014.
- ↑ HangingTogether.org: OCLC Control Numbers in the Wild. 11. Oktober 2013 .
- ↑ VIAF Council. In: www.oclc.org. OCLC, 20. Dezember 2019, abgerufen am 25. April 2020 (Lua error in Module:Multilingual at line 149: attempt to index field 'data' (a nil value).).
- ↑ Maximilian Klein, Alex Kyrios: VIAFbot and the integration of library data on Wikipedia. In: The Code4Lib Journal. Nr. 22, 14. Oktober 2013, ISSN 1940-5758 (code4lib.org).
- ↑ Jay Jordan: Letter to members 2010. OCLC, 17. März 2010, archiviert vom am 26. März 2010 .
- ↑ Michael Rogers: CLC/OCLC Pica Merge (Memento des vom October 28, 2008 im Internet Archive) In: Library Journal October 30, 2007
- ↑ Wilson, Lizabeth; Neal, James; Jordan, Jay (October 2006). "RLG and OCLC: Combining for the Future" (guest editorial). Library and Information Science. Vol. 6, no. 4. Retrieved via Project Muse database, 2017-06-21.
- ↑ RLG to combine with OCLC. In: worldcat.org. OCLC, 3. Mai 2006, abgerufen am 22. Juni 2017. Press release.
- ↑ OCLC acquires EZproxy authentication and access software. In: www.oclc.org. 11. Januar 2008, archiviert vom am 17. Januar 2008 .
- ↑ OCLC acquires Dutch library systems provider HKA. In: STM Publishing News. 2. Oktober 2013, abgerufen am 25. April 2020.
- ↑ Marshall Breeding: OCLC acquires the Dutch ILS provider HKA. In: Smart Libraries Newsletter. 33. Jahrgang, Nr. 11, November 2013, S. 2–6 (librarytechnology.org [abgerufen am 25. April 2020]).
- ↑ Gary Price: Print Collections: OCLC Acquires Sustainable Collection Services. In: Infodocket. 13. Januar 2015, abgerufen am 6. März 2015.
- ↑ OCLC agrees to acquire Relais International to provide library consortia more options for resource sharing. In: www.oclc.org. 17. Januar 2017, abgerufen am 16. Mai 2017.
- ↑ Mergers and acquisitions. In: www.oclc.org. OCLC, 26. März 2021, abgerufen am 18. Juni 2021.
- ↑ Jeffrey Beall: Radical Cataloging: Essays at the Front. Hrsg.: K.R. Roberto. McFarland & Company, Jefferson, NC 2008, ISBN 978-0-7864-3543-2, OCLC: A Review, S. 85–93 (rclis.org [PDF]).
- ↑ Rick Mason: OCLC: A Review (a review). In: libology.com. 10. Juni 2008, abgerufen am 7. Februar 2020.
- ↑ Policy for Use and Transfer of WorldCat Records. In: marc.coffeecode.net. Abgerufen am 6. Februar 2020. Archived image of OCLC webpage dated November 2, 2008.
- ↑ OCLC Policy Change. In: wiki.code4lib.org. Abgerufen am 18. Juli 2020.
- ↑ 61.0 61.1 61.2 McKenzie, Elizabeth (January 2012). OCLC changes its rules for use of records in WorldCat: library community pushback through blogs and cultures of resistance (Technical report). Boston: Suffolk University Law School. Research paper 12-06.
- ↑ Stop the OCLC powergrab! In: watchdog.net. 18. Februar 2009, archiviert vom am 18. Februar 2009; abgerufen am 6. Februar 2020.
- ↑ Stealing Your Library: The OCLC Powergrab (Aaron Swartz's Raw Thought). In: aaronsw.com. 4. Juni 2011, archiviert vom am 4. Juni 2011; abgerufen am 6. Februar 2020.
- ↑ Timothy Vollmer: Library catalog metadata: Open licensing or public domain? In: Creative Commons. 14. August 2012, abgerufen am 6. Februar 2020.
- ↑ Gary Price: Metadata/Catalog Records: National Library of Sweden Signs Agreement With OCLC Re: CC0 License. In: Library Journal. 14. Februar 2014, abgerufen am 6. Februar 2020.
- ↑ Karen Coyle: SkyRiver Sues OCLC over Anti-Trust. Karen Coyle, 29. Juli 2010 .
- ↑ Marshall Breeding: SkyRiver and Innovative Interfaces File Major Antitrust Lawsuit Against OCLC. In: Library Journal. 29. Juli 2010, archiviert vom am 2. August 2010 .
- ↑ Gary Price: III Drops OCLC Suit, Will Absorb SkyRiver. In: Library Journal. 4. März 2013 .
- ↑ Roger C. Schonfeld: What Are the Larger Implications of Ex Libris Buying Innovative? In: sr.ithaka.org. 5. Dezember 2019, abgerufen am 25. April 2020.
Further reading
- Claire-Lise Bénaud, Sever Bordeianu: OCLC's WorldShare Management Services: a brave new world for catalogers. In: Cataloging & Classification Quarterly. 53. Jahrgang, Nr. 7, Oktober 2015, S. 738–752, doi:10.1080/01639374.2014.1003668.
- Cathy Blackman, Erica Rae Moore, Michele Seikel, Mandi Smith: WorldCat and SkyRiver: a comparison of record quantity and fullness. In: Library Resources & Technical Services. 58. Jahrgang, Nr. 3, Juli 2014, S. 178–186, doi:10.5860/lrts.58n3.178.
- Marshall Breeding: Library services platforms: a maturing genre of products. In: Library Technology Reports. 51. Jahrgang, Nr. 4, Mai 2015, S. 1–38, doi:10.5860/ltr.51n4.
- Jay Jordan (Hrsg.): Weaving libraries into the web: OCLC 1998–2008. Routledge, London; New York 2011, ISBN 978-0-415-57690-1.
- Kathleen L. Maciuszko: OCLC, a decade of development, 1967–1977. Libraries Unlimited, Littleton, Colo. 1984, ISBN 0-87287-407-9 (archive.org).
- Joseph R. Matthews: An environmental scan of OCLC alternatives: a management perspective. In: Public Library Quarterly. 35. Jahrgang, Nr. 3, Juli 2016, S. 175–187, doi:10.1080/01616846.2016.1210440.
- Ellen Richardson: Ain't no (Sky)River wide enough to keep me from getting to you: SkyRiver, Innovative, OCLC, and the fight for control over the bibliographic data, cataloging services, ILL, and ILS markets. In: Legal Reference Services Quarterly. 31. Jahrgang, Nr. 1, Januar 2012, S. 37–64, doi:10.1080/0270319X.2012.654065.
- K. Wayne Smith (Hrsg.): OCLC, 1967–1997: thirty years of furthering access to the world's information. Haworth Press, New York 1998, ISBN 0-7890-0536-0 (archive.org).
- WorldCat data licensing. In: oclc.org. Abgerufen am 31. Dezember 2018. See also: Data licenses & attribution. In: oclc.org. 14. Januar 2017, abgerufen am 31. Dezember 2018. Information about licensing of WorldCat records and some other OCLC data.
External links
- Lua error in Module:Official_website at line 90: attempt to index field 'wikibase' (a nil value).
- Hanging Together – the OCLC Research blog.
- OCLC Annual Reports collection. In: OCLC Archives.
- WorldCat.org.
- Literatur von und über OCLC in der bibliografischen Datenbank WorldCat
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