Centre Square Water Works, Drawings of Intake Basin
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
Fairmount Water Works, W.H. Bartlett, 1839
Fairmount Water Works from the forebay, 1833
Roman Aqueduct in Segovia, Spain
Thomas Run sewer outlet during construction
Perkiomen Water Supply Surveys, 1866
Frankford Creek: Sad History of an Urban Stream title page
The Water Works in Centre Square, Philadelphia