Army Corps of Engineers 1882 Report on Navigation in Frankford Creek
Old News: Two unusual underground rescues
Sandy Run Watershed and the Holmesburg Water Works
Lower Dublin Township, Philadelphia County, in 1848
Dripps map of Frankford and vicinity, 1849
Pennypack Park Map
Plans and maps of the Pennypack Creek Watershed in Philadelphia
Map of Frankford Borough, 1845
Philadelphia’s Sewer Problem
Sewer systems, City of Philadelphia, 1927 and 1929