@book{17864,
	author = {National Science Board U.S. and National Science Board U.S.},
	title = {Patterns and perspectives in environmental science},
	publisher = {The Board : for sale by the Supt. of Docs., U.S. Govt. Print. Off.},
	year = {1972.},
	address = {[Washington]},
	note = {"NSB 73-2."}
}