@book{73600,
	author = {Van Dyne, George M., and American Society of Range Management.},
	title = {The ecosystem concept in natural resource management /},
	publisher = {Academic Press,},
	year = {c1969.},
	address = {New York :},
	note = {"Based on a symposium held at the annual meeting of the American Society of Range Management in Albuquerque, New Mexico on February 12-15, 1968."}
}