Plan of the City of Philadelphia and Adjoining Districts, 1830
Map of the County of Philadelphia from Actual Survey, 1843
Outline Map of the County and City of Philadelphia and Vicinity, 1883
Schuylkill River Hydrographical Survey 1861-66 by H. P. M. Birkinbine
Captain Sewer and Michael Nutter, 1998
Bureau of Water Spring Garden Testing Station, 1901
Northern Liberties and Spring Garden Water Works
Engine House of the Belmont Works
Fairmount Park, bird’s eye view from Lemon Hill, detail
Sketch of aquarium in former FWW building, interior, ca. 1950