For medicine/biology http://www.ncbi.nlm.nih.gov/.
During studies I used EBSCO www.search.ebscohost.com , there is almost every field, from Astronautics to Zoology :-), but access to some resources is limited.
During studies I used EBSCO www.search.ebscohost.com , there is almost every field, from Astronautics to Zoology :-), but access to some resources is limited.
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