@book{12195,
	author = {Marquis, Ralph William, and Graduate School, USDA.},
	title = {Environmental improvement;},
	publisher = {Graduate School, U.S. Dept. of Agriculture},
	year = {[1966]},
	address = {[Washington]},
	note = {Text of the lectures presented at the lecture series, Environmental improvement, U.S. Dept. of Agriculture, May 1966.}
}