 
		 
		 
		McConnell Germ-Proof Filters ad
 
		Bureau of Water Spring Garden Testing Station, 1901
 
		Northeast Sewage Plant opening, 1951
 
		Southeast Sewage Treatment Works diagram, 1955
 
		Outside Sprinkling Filters, Spring Garden Sewage Experiment Station, 1911
 
		Water Before and After Roxborough
