@book{11434,
	author = {Clark, Charles Frederick, and Lombard, P. M.},
	title = {Descriptions of and key to American potato varieties},
	publisher = {[U.S. Govt. Print. Off.]},
	year = {1951.},
	series = {U. S. Dept. of Agriculture. Circular},
	address = {Washington},
	edition = {[Rev.]},
	note = {Cover title.}
}