Plans and maps of the Pennypack Creek Watershed in Philadelphia
Ghosts of Water in Fairmount Park, Part II, with Adam Levine
Plan of Philadelphia, John Hills, 1796
Wingohocking Sewer across Penn St.
Frankford Creek Watershed: A historical overview of the Philadelphia section
Report on channelization of Frankford Creek for flood control (1947)
Frankford Creek Watershed Historical Timeline
Two Frankford Creek Bridges, 1896-1899
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