


Centre Square Water Works, Drawings of Intake Basin

Centre Square Water Works, Frederick Graff, Sr. Plans, 1799

Centre Square Water Works, Latrobe Plans, 1799

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

Dobson’s Mill, 1884, from History of Philadelphia by Scharf & Wescott

A Day in the Ma’sh – Oil Refinery

Perkiomen Water Supply Surveys, 1866
