@book{54230,
	author = {Wilken, Gene C. and Hernández Xolocotzi, Efraím.},
	title = {Agricultura en los campos drenados :},
	publisher = {Escuela Nacional de Agricultura. Colegio de Postgraduados,},
	year = {1975.},
	address = {Chapingo, Méx. :},
	note = {Trad. de: The Geograph. Review 59(2): 215-241}
}