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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).
Refdesk - free and family-friendly web site that indexes and reviews quality, credible, and current web-based resources; DeepDyve - big archive of literary and scholarly journal articles; free five-minute full-text previews.
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).
Apollo 12 (November 14–24, 1969) was the second crewed landing on the Moon.The sixth crewed mission in the U.S. Apollo program, it was launched by NASA from the Kennedy Space Center, Florida.
Encompasses articles on the topic of mathematics: Free Encyclopedia of Triangle Centers: English Information about ten thousands of triangle centers, including coordinates, operations, incidence, equations, etc. Free EqWorld: English, Russian Articles on mathematical equations: Free MathWorld: English Articles on a wide variety of mathematics ...
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.
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 ...
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. True open-access journals can be split into two categories: