Mill Creek Sewer under construction, 1883
Bridge Street Draw, Cofferdam, ca. 1896
PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
Torresdale Conduit work gang, 12/18/1906
Nine visiting nurses ready for work, ca. 1909
Immigrant family, ca. 1900, nurse in black
Jar of raw sewage before treatment, 2000
City officials tour new interceptor sewer, 1953
Allegheny Avenue Sewer at Pier 126, 1918