Fair Mount Water Works engine house, 1819
Centre Square Engine House, ca. 1807
19th century life in South Philadelphia’s marshland
Thomas Run sewer outlet at Cobbs Creek
Delaware River at Arch Street from the New Jersey side, 1914
Bacteria in Delaware River, Torresdale Filters, 1913
Water, Water Everywhere – Philadelphia Record, 1937-03-14
Perkiomen Water Supply Surveys, 1866
Frankford Creek: Sad History of an Urban Stream title page
Logan Demanding Flood Relief, 8/18/38