Centre Square Water Works, Drawings of Intake Basin
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
Centre Square Water Works, Latrobe Plans, 1799
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
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