Drainage area plan, early 19th century
Diagram from sewage treatment plan for Philadelphia, 1912
Down Under, Part 2: Beaver Creek as it appears today
Dauphin and Sydenham car crash, Jan. 17, 1978
Plan and profile of proposed Delaware Seventh St. Sewer, 1850
Plan of Pine Street Sewer, 1830
Typhoid bacteria diagram, 1905
“A Decidedly Mixed Drink,” April 6, 1899
“Town street scavengers from life,” Kollner, 1844
Norman Lofton inspects sewer at Ditman and Sheffield, 1987