@book{47737,
	author = {Davis, Mackenzie Leo, 1941- and Cornwell, David A., 1948-},
	title = {Introduction to environmental engineering. (2nd ed.)},
	publisher = {McGraw-Hill},
	year = {1991},
	series = {McGraw-Hill series in water resources and environmental engineering},
	address = {New York:},
	edition = {2nd ed.}
}