Bridge Street Draw, intermediate pier, ca. 1896
Bridge Street Draw, looking north, ca. 1896
“A Snake That Will Be Straightened Out,” map of Frankford Creek with proposed changes, 1949
Map of the County of Philadelphia from Actual Survey, 1843
Outline Map of the County and City of Philadelphia and Vicinity, 1883
Electric Pump Installations at Lardner’s Point Pumping Station
Pennypack Sewage Treatment Works, 1914
State Road triple pipeline construction, 1904