Free Online JournalsAmerican Society for Microbiology Journals – access to ASM's online primary-research journals is free 6 months after an issue's publication.
Directory of Open Access Journals – scientific and scholarly journals.
Free Medical Journals Site – access to many open access medical journals.
Highwire – free full-text life sciences articles.
Proceedings of the National Academy of Sciences – free full-text back to 1915, with the exception of the most recent six months.
Public Library of Science – free scientific and medical journals.
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