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Inclusion on the list doesn't automatically mean the absolute truth is on these websites, so always be critical and compare information between different sources. The content of the subsections is alphabetically organized. Please add free online sources if you know some that are missing in this list, but try to keep it relevant and trustworthy.
Science.gov provides a search of over 45 scientific databases and 200 million pages of science information with just one query, and is a gateway to over 2000 scientific Websites. Free Science.gov Alliance, 18 scientific and technical organizations from 14 federal agencies that contribute to Science.gov. United States Department of Energy ...
PubMed Central (PMC) is a free digital repository that archives open access full-text scholarly articles that have been published in biomedical and life sciences journals. As one of the major research databases developed by the National Center for Biotechnology Information (NCBI), PubMed Central is more than a document repository.
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:
The journals are grouped into four main sections: Physical Sciences and Engineering; Life Sciences; Health Sciences; Social Sciences and Humanities.; Article abstracts are freely available, and access to their full texts (in PDF and, for newer publications, also HTML) generally requires a subscription or pay-per-view purchase unless the content is freely available in open access.
All texts are available for free download in PDF format. The platform features advanced search capabilities and optical character recognition (OCR) options The Society for the Preservation of Hebrew Books Heidelberg University Digital Library: General Scientific publications, European historic literature of German and Latin languages
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Life Sciences: Preprint server with integrated option of peer review by invited experts, suggested by the authors, done openly after publication >1,000 2012 F1000 Research Ltd. FocUS Archive: Ultrasound research A free preprint service for the focused ultrasound research community <100 2018 Center for Open Science: Frenxiv: Multidisciplinary