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Yale Library holds many maps in its collections. An extensive collection of pre-1900 maps can be found in the Beinecke Library's collections - several of these have been digitized and can be found via Beinecke Digital Collections.
Includes newspapers, correspondence, oral histories, and other primary sources from Chicago, Brooklyn, NY, and other U.S. cities. Click on the "Nature and Scope" link in order to read more about the archival materials contained in this database.
The starting point for online research on the U.S. Congress. Includes documents such as bills, transcripts of Congressional Hearings, the Congressional Record, and Congressional Research Service reports.