Science.govProvides access to authoritative, selected science information from U.S. Government agencies, including research and development results.
Tree of LifeOrganisms and their evolutionary history and taxonomy.
Department of Agriculture (USDA)Public policy on food, agriculture, natural resources, rural development, nutrition, and related issues.
Biodiversity Heritage LibraryA consortium of natural history and botanical libraries that cooperate to digitize the legacy literature of biodiversity held in their collections.
Google PatentsFull text US patent documents from 1790 to the present that is fully indexed and searchable.