


Mill Creek Sewer under construction, 1883

Bridge Street Draw. Southwest side of bridge. April 19, 1896. [Detail].

Bridge Street Draw, April 19, 1896. [Detail of men]

“Philadelphia Underground,” Jan. 29, 1961

Torresdale Conduit work gang, 12/18/1906

Bureau of Water, Cumberland, west of 13th Street, pipe line, 1907

State Street pipeline construction, 1904

Pipe Test, 1914
