@book{12559,
	author = {Martin, Franklin W. and Gaskins, Murray H.,},
	title = {Cultivation of the sapogenin-bearing Dioscorea species},
	publisher = {Agricultural Research Service, U.S. Dept. of Agriculture},
	year = {[1968]},
	series = {United States. Dept. of Agriculture. Production research report},
	address = {Washington]}
}