Source:Colton
From Pittsburgh Streets
The Cities of Pittsburgh and Allegheny, with Parts of Adjacent Boroughs, Pennsylvania. 1855. Historic Pittsburgh DARMAP0089; https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~1688~130047; https://collections.lib.uwm.edu/digital/collection/agdm/id/32240; 1855 layer at Pittsburgh Historic Maps (https://esriurl.com/pittsburgh). In George W. Colton, Colton's Atlas of the World: Illustrating physical and political geography, J. H. Colton & Co., New York, 1856 (https://www.davidrumsey.com/luna/servlet/view/search?q=Pub_List_No%3D0149.000).
