 
		 
		 
		Fairmount Water Works (Picturesque America)
 
		Schuylkill Navigation lock at Fairmount (Picturesque America)
 
		Wissahickon Pipe Aqueduct, Roxborough to Mt. Airy, 1868
 
		Plan of Philadelphia, John Hills, 1796
 
		Queen Lane Pumping Station, proposed design
 
		Listening for leaks
 
		Centre Square Water Works, Drawings of Intake Basin
 
		Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
 
		Centre Square Water Works, Latrobe Plans, 1799
 
		Typhoid bacteria diagram, 1905
