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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Keesing's World News Archive contains about 95,000 unbiased, full-text reports of the most historically significant political, social, and economic events of the world since 1931.
Archive of California's legislative information for dates 1993 to the present. Files available by using the Downloadable Database.
Oral histories gathered by the U.S. National Library of Medicine.