The Schuylkill and Wissahickon banks in 1858
Glossary of Drainage Terms by C. Drew Brown
Centre Square Water Works, Drawings of Intake Basin
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
The Centre Square Works, 1801
Native American Heritage Day
The Water and Drainage History of Philadelphia: A seven-part course
The Water and Drainage History of Philadelphia, Part 6
The Water and Drainage History of Philadelphia, Part 5
