Report on channelization of Frankford Creek for flood control (1947)
Down Under, Part 2: Beaver Creek as it appears today
Bottled vs. Tap in 1906
Stormwater Songs by John and Jan Haigis
Cobbs Creek in the Days of the Old Powder Mill
1826 Report of the Committee of Delaware County on the subject of Manufactories, Unimproved Mill Seats, etc. in said county.
Typhoid Fever and sewage tainted drinking water: An 1889 report from the Philadelphia Board of Health
Wooden Pipes in Philadelphia
Lighthouses along the Delaware, 1913
An electrifying experience
