Science.gov searches over 60 databases and over 2,200 scientific websites to provide users with access to more than 200 million pages of authoritative federal science information including research and development results.
ProQuest Science Database is a definitive resource for students studying both the applied and general sciences with coverage dating back to 1986
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The Public Library of Science (PLoS) is a non-profit organization of scientists and physicians committed to making the world's scientific and medical literature a freely available public resource. PLoS has published its own journals, including PLoS One, PLoS Biology and PLoS Medicine, and a suite of community-focused journals including PLoS Computational Biology, PLoS Genetics, PLoS Pathogens.