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
Torresdale Conduit work gang, 12/18/1906
Bureau of Water, Cumberland, west of 13th Street, pipe line, 1907
Oak Lane Reservoir pipeline, 1904
State Street pipeline construction, 1904