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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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.