Plan of Philadelphia, John Hills, 1796
Early photographs of Fairmount and vicinity, 1848
Spring Garden Northern Liberties, or Schuylkill Works (1844)
Bureau of Water Spring Garden Testing Station, 1901
Pipes, distribution mains, transmission mains, filtration plants, pumping stations, and all other appurtenances, either above or underground, that relate to providing drinking water to homes and businesses. In tandem with sewer systems, properly-designed water supply systems are what make densely-populated urban areas possible.