The Gilder Lehrman Institute of American History
Primary sources in American history from 1493 onwards, including more than 60,000 letters, diaries, maps, pamphlets, printed books, newspapers, photographs, and ephemera.
From the Gilder Lehrman Institute of American History at the New-York Historical Society, which is purported to be one of the nation’s great archives in the Revolutionary, early national, antebellum, and Civil War periods.