Thomas R. Morris, “Richard Henry Cardwell (1846-1931),” Dictionary of Virginia Biography (1998).
Library of Virginia (Personal Papers Collection)
Frank G. Ruffin Scrapbooks and Papers, 1874-1892; 33 leaves and 8 p.
Includes a letter to Cardwell regarding remarks he made in a speech in the Virginia House of Delegates.
University of Virginia (Albert and Shirley Small Special Collections Library)
Whittle Family Papers, 1753-1960; 650 items.
Cardwell is represented in the Supreme Court correspondence of Stafford Gordon Whittle, 1901-1919.