@book{57665,
	author = {"Ritchey, S.J. & Cairns,J., Ed."},
	title = {Ecology of land : Symposium sponsored by society of the Sigma X1 and Center for Environmental Studies},
	publisher = {Verginia Polytechnic Inst. & State Univ.},
	year = {Blacksburg(Verginia)},
	address = {1972}
}