 
		 
		 
		Birch’s Views of Philadelphia, 1800
 
		Pipeline being laid in Wissahickon Avenue
 
		Mill Creek Sewer under construction, 1883
 
		Fairmount Water Works, W.H. Bartlett, 1839
 
		Fairmount Water Works from the forebay, 1833
 
		Fourth of July, Centre Square, ca. 1812
 
		Wooden Water Pipe, removed from Market Street, December 6, 1901
 
		Centre Square Engine House, ca. 1807
 
		Norman Lofton inspects sewer at Ditman and Sheffield, 1987
 
		Sewer crawler Clarence Baskerville checks tunnel for leaks. He has faced the dangers of working in sewers for past three years, 1971
