Diagram from sewage treatment plan for Philadelphia, 1912
Southwest Sewage Treatment Plant under construction, 1949
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
Mill Creek Sewer under construction, 1883
“A Decidedly Mixed Drink,” April 6, 1899
“Town street scavengers from life,” Kollner, 1844
Norman Lofton inspects sewer at Ditman and Sheffield, 1987