Robert and Washington Caldwell papers 1823-1901 (bulk 1840-1901)
Additional Descriptive Data
The surveyor's map has been separately catalogued: Heastings, E. H, and A. M Buckmaster. Draught of a Survey Made for Mr Robert Colwell On Plum Creek, In Allegheny County, Pennsylvania Containing As Stated There In: May 1853 And July 1853. 1854.
History of Allegheny County, Pennsylvania: Including Its Early Settlement and Progress to the Present Time... Volume 2. Chicago: A. Warner, 1889.