Plan of Pine Street Sewer, 1830
Mill Creek Sewer under construction, 1883
Fairmount Water Works, W.H. Bartlett, 1839
Centre Square Engine House, ca. 1807
Thomas Run sewer outlet during construction
Dobson’s Mill, 1884, from History of Philadelphia by Scharf & Wescott
A Day in the Ma’sh – Oil Refinery
Perkiomen Water Supply Surveys, 1866
Frankford Creek: Sad History of an Urban Stream title page
Wood truss drawbridge, Orthodox Street over Frankford Creek, rebuilt 1899