“Philadelphia Underground,” Jan. 29, 1961
“Sewer Crawlers,” January 29, 1961
PWD water tech at the Philly Home Show, 1960 (detail)
Torresdale Conduit work gang, 12/18/1906
Bureau of Water, Cumberland, west of 13th Street, pipe line, 1907
State Street pipeline construction, 1904
Nine visiting nurses ready for work, ca. 1909
Pipe Test, 1914
Sewer construction, Rock Run, 1922
State Road triple pipeline construction, 1904