Bethlehem Water Works, 2011
Bacteria in Delaware River, Torresdale Filters, 1913
Water, Water Everywhere – Philadelphia Record, 1937-03-14
Perkiomen Water Supply Surveys, 1866
The Water Works in Centre Square, Philadelphia
“Philadelphia Underground,” Jan. 29, 1961
Centennial Exhibition situation plan, 1876
PWD water tech at the Philly Home Show, 1960 (detail)
Lab tech, water cleaning demo, Philly Home Show, 1960
Oak Lane Reservoir pipeline, 1904
