Perkiomen Water Supply Surveys, 1866
Map of the County of Philadelphia from Actual Survey, 1843
Schuylkill River Hydrographical Survey 1861-66 by H. P. M. Birkinbine
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
‘Gillette, All By Himself, Gets Fine New Idea On Germ Slaying’
Outhouse over the Schuylkill near Pottstown
Northern Liberties and Spring Garden Water Works
Electric Pump Installations at Lardner’s Point Pumping Station
Fairmount Park, bird’s eye view from Lemon Hill, detail
“Philadelphie,” Bird’s Eye View, 1855
