Plans and maps of the Pennypack Creek Watershed in Philadelphia
Ghosts of Water in Fairmount Park, Part II, with Adam Levine
Wingohocking Sewer across Penn St.
Philadelphia’s Sewer Problem
Diagram from sewage treatment plan for Philadelphia, 1912
Southwest Sewage Treatment Plant under construction, 1949
Frankford Creek Watershed: A historical overview of the Philadelphia section
Frankford Creek Watershed Historical Timeline
Down Under III: A walk in the Dobson’s Run Storm Relief Sewer, June 15, 2010
Requiem for a stream: A brief history of Dobson’s Run