 
		 
		 
		Diagram from sewage treatment plan for Philadelphia, 1912
 
		Three reports on Philadelphia’s Sewage Treatment Project, 1911-1914
 
		Emscher Tank Installation at Essen Nord, Germany
 
		Thomas Run sewer outlet at Cobbs Creek
 
		Thomas Run sewer outlet during construction
 
		Cohocksink Sewer System outlet at Laurel Street
