Wissahickon Pipe Aqueduct, Roxborough to Mt. Airy, 1868
Map Lovers’ Monday: 1891 Water Supply Plan
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
Requiem for a stream: A brief history of Dobson’s Run
Down Under, Part 2: Beaver Creek as it appears today
Aramingo Canal, Then and Now
Northeast Philadelphia history, one page at a time: The Holmesburg Library Scrapbook Collection
Half a Century of Clean Water