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  2. List of academic databases and search engines - Wikipedia

    en.wikipedia.org/wiki/List_of_academic_databases...

    The terms "free", "subscription", and "free & subscription" will refer to the availability of the website as well as the journal articles used. Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required).

  3. Wikipedia:List of free online resources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:List_of_free...

    ipl2 - merger of the collections of resources from the Internet Public Library (IPL) and the Librarians' Internet Index (LII) websites, hosted by Drexel University College of Information Science and Technology; Refdesk - free and family-friendly web site that indexes and reviews quality, credible, and current web-based resources

  4. PubMed Central - Wikipedia

    en.wikipedia.org/wiki/PubMed_Central

    PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article resides elsewhere (in print or online, free or behind a subscriber paywall).

  5. List of online encyclopedias - Wikipedia

    en.wikipedia.org/wiki/List_of_online_encyclopedias

    Free Cyclopaedia of Political Science, Political Economy, and the Political History of the United States: English Articles about science, economics, and American authors. The 1899 edition is available online Free Diplopedia: English US State Department internal encyclopedic wiki, available for diplomats and overseas US agents to use

  6. PubMed - Wikipedia

    en.wikipedia.org/wiki/PubMed

    PubMed is a free database including primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.

  7. List of open-access journals - Wikipedia

    en.wikipedia.org/wiki/List_of_open-access_journals

    This is a list of open-access journals by field. The list contains notable journals which have a policy of full open access. It does not include delayed open access journals, hybrid open access journals, or related collections or indexing services.

  8. Google Scholar - Wikipedia

    en.wikipedia.org/wiki/Google_Scholar

    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 ...

  9. Semantic Scholar - Wikipedia

    en.wikipedia.org/wiki/Semantic_Scholar

    Semantic Scholar is free to use and unlike similar search engines (i.e. Google Scholar) does not search for material that is behind a paywall. [ 5 ] [ citation needed ] One study compared the index scope of Semantic Scholar to Google Scholar, and found that for the papers cited by secondary studies in computer science, the two indices had ...

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