 
		 
		 
		Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
 
		Electric Pump Installations at Lardner’s Point Pumping Station
 
		View from the Inclined Plane near Philadelphia, 1838
 
		Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
