(1) http://highwire.stanford.edu/lists/freeart.dtl
(2)http://www.doaj.org/doaj?func=se ... l&b1=and&q2=&f2=all
(3)https://tspace.library.utoronto.ca/
(4)http://www.pnas.org/
(5)http://www.freemedicaljournals.com/
(6)http://www.genetics.org/
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