Source:Ihmsen-coal-hill-lots-plan
From Pittsburgh Streets
"Plan of Lots Situated on the South Side of the Monongahela River: Being a part of the Coal Hill Lots Tract in the plan of the Manor of Pittsburgh, now 17th & 18th Wds., laid off for C. Ihmsen." Laid out Apr. 16, 1845; recorded Aug. 31, 1847, Plan Book 1, p. 122. Allegheny County Recorder of Deeds 3778222.
