Robert and Washington Caldwell papers 1823-1901 (bulk 1840-1901)
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The following broadsides are housed separately:

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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.