Sandy Run Watershed and the Holmesburg Water Works
Drainage area plan, early 19th century
Plans and maps of the Pennypack Creek Watershed in Philadelphia
Wingohocking Sewer across Penn St.
Sewer systems, City of Philadelphia, 1927 and 1929
History of Belfield (1934)
Frankford Creek Watershed: A historical overview of the Philadelphia section
Frankford Creek Watershed Historical Timeline
Frankford Creek Watershed in the context of the development of Philadelphia’s sewers and sewage treatment system
Down Under III: A walk in the Dobson’s Run Storm Relief Sewer, June 15, 2010