Science

BioMed Central
BioMed Central publishes a number of journals that are available as open access, including Environmental Health and the Journal of biology.
Google Scholar
This is a search engine for scholarly publication from peer-reviewed jounals, professional socities, books, theses, and other sources. (Sometimes difficult to get full-text )
Highwire Press
This site offers free articles in biological, physical and social sciences and medicine. The site includes a search engine.
OAlster
OAlster (pronounced "oyster") indexes over three million digitized resources worldwide and can be limited to text, images, audio, or video files.
Public Library of Science
Public Library of Science (PLOS) makes articles available free of charge. Journals include Biology, Medicine, Genetics, Pathogens and Diseases
Scitopia
Scitopia is a federated ("one-stop shopping") search portal for publications of a number of professional societies in the areas of science and technology. Over three million documents, including patents and government publications, can be found here.
Scirus
This is an archive of open-access articles and reports on Science and Technology.
The Directory of Open Access Journals
The Directory of Open Access Journals includes articles from more than 700 titles from around the world. Ethics in Science and Environmental Politics, Fishery Bulletin, Journal of Construction Education, and Biopolicy Journal are just a few of the titles included.

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