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Searches publicly-available grey literature from governmental and academic servers throughout the world.

Offers a searchable database of full text documents published online by the Environmental Protection Agency (EPA).

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.

WorldWideScience.org is a global science gateway comprised of national and international scientific databases and portals.