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(National Center for Biotechnology Information) PubMed Central is a free digital archive of over 2 million articles from biomedical and life science journal literature at the U.S. National Institutes of Health (NIH).
(Ontario Council of University Libraries (OCUL)) Journal articles from most academic disciplines. You will only have access to full-text articles that result from checking "Open Access Articles" before running your search.
(ProQuest) Part of ProQuest Central. For students learning general and applied science. Coverage dates back to 1986 for more than 1,030 titles, 760 of them full-text. It allows you to search over 2,700,000 records, dating back to the mid-1980s.
(Elsevier) Provides users with access to a wide range of journal articles and full-text e-books in Health and Life Sciences, Physical Sciences and Engineering, Computers and Technology, and the Social and Behavioural Sciences.