@book{11545,
	author = {Hull, A. C. and Johnson, W. M.},
	title = {Range seeding in the ponderosa pine zone in Colorado /},
	publisher = {U.S. Dept. of Agriculture,},
	year = {1955.},
	series = {Circular / United States Department of Agriculture ;},
	address = {Washington, D.C. :}
}