Source:Hillsborough-alley-agreement-1810
From Pittsburgh Streets
Robert Campbell, Robert Cummins, John Anderson, John Stranahan, and Thomas Richardson. Articles of agreement for the opening of Hillsborough Alley. Oct. 25, 1810. In the papers of the Campbell family, 1807–1873, MSS #4, Historical Society of Western Pennsylvania, Detre Library and Archives, Heinz History Center (see Historic Pittsburgh US-QQS-MSS4).
