@book{12415,
	author = {United States. and United States.},
	title = {Varieties of alfalfa.},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1968]},
	series = {United States. Dept. of Agriculture. Farmers' bulletin ;},
	address = {Washington,},
	edition = {[Rev.},
	note = {Revised ed. of its Alfalfa varieties and areas of adaptation, issued as U.S. Dept. of Agriculture. Leaflet no. 507.}
}