Thomas Mill Covered Bridge over Wissahickon Creek (Picturesque America)
From Creek To Sewer
The Water and Drainage History of Philadelphia
The Water and Drainage History of Philadelphia, Part 6
The Water and Drainage History of Philadelphia, Part 5
The Water and Drainage History of Philadelphia, Part 4
The Water and Drainage History of Philadelphia, Part 3
The Water and Drainage History of Philadelphia, Part 2
