Centre Square Water Works, Latrobe Plans, 1799
Two reports on the state of the Schuylkill River, 1867
Duplex Pumping Engine, Belmont Works
Material, both historical and contemporary, that covers Philadelphia's pumping stations, which are mammoth structures that move tremendous quantities of water from place to place all around the region. Philadelphia has had nine (?) pumping stations throughout her history, beginning with the Fairmount Water Works; four are currently in operation.