Second Bank of Pennsylvania, South Second Street, Philadelphia
Wooden Water Pipe, removed from Market Street, December 6, 1901
Centre Square Engine House, ca. 1807
“Town street scavengers from life,” Kollner, 1844
Southeast Corner of Third and Market, Philadelphia
Half a Century of Clean Water
View from front of 322 S. 44th, April 18, 1914
Volume of Sludge from 1,000,000 Gallons of Sewage
Diagram Showing Rate Between Bulk of Wet Sludge and Its Percentage Moisture
Sludge Drying Beds, Essen Nord, Germany