Searches across 39 molecular and literature database maintained by NCBI (the National Center for Biotechnology Information). Results are listed by database so a single search can lead to discover of different types of data. Good for a broad overview.
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Online Index-Catalogue of the Library of the Surgeon-General's Office, an index of medical and scientific publications from 1880-1961; eTK, covering medieval Latin; eVK2, covering medieval English texts; and other selected historical resources.
Contains nearly 200 Social Science databases covering all 50 U.S. states. The California (CA) collection contains these 200 U.S. databases, plus about 80 detailed databases on California. The Texas (TX) collection contains these 200 U.S. databases, plus about 60 detailed databases on Texas.