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Online public access catalog. The online public access catalog ( OPAC ), now frequently synonymous with library catalog, is an online database of materials held by a library or group of libraries. Online catalogs have largely replaced the analog card catalogs previously used in libraries.
The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is available.
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...
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WorldCat. WorldCat is a union catalog that itemizes the collections of tens of thousands of institutions (mostly libraries ), in many countries, that are current or past members of the OCLC global cooperative. [ 3] It is operated by OCLC, Inc. [ 4] Many of the OCLC member libraries collectively maintain WorldCat's database, the world's largest ...
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The data takes Pfizer one step closer to securing U.S. regulatory approval for a second gene therapy to treat hemophilia. Pfizer had received the Food and Drug Administration's nod for Beqvez as a ...
v. t. e. Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis, but has expanded dramatically. [ 7][ 8]