 
		 
		 
		Southwest Sewage Treatment Plant under construction, 1949
 
		Plan and profile of proposed Delaware Seventh St. Sewer, 1850
 
		Plan of Pine Street Sewer, 1830
 
		Bridge Street Draw with draw open, July 26, 1897
 
		Bridge Street Draw, intermediate pier, ca. 1896
 
		Pipe Test, 1914
 
		Devereaux Street Sewer, Philadelphia magazine, 1911
