@book{7889,
	author = {Shantz, H. L.},
	title = {Natural vegetation as an indicator of the capabilities of land for crop production in the Great Plains area.},
	publisher = {Govt. Print. Off.,},
	year = {1911.},
	series = {U. S.  Dept of Agriculture.  Bureau of Plant Industry.  Bulletin},
	address = {Washington,}
}