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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Searches multiple U.S. federal government databases. Includes health, environment, agriculture, business, education, history, and more.
Contains 141 digitized volumes of the Queen's personal journals, written between 1832-1901.