@book{71334,
	author = {Congreso Internacional de la Ciencia del Suelo and Colegio de Postgraduados. Montecillo, Méx.},
	title = {Research for maximum yield in harmony with nature satellite symposium sponsored by PPI},
	publisher = {Sociedad Mexicana de la Ciencia del Suelo,},
	year = {1994},
	address = {México, D. F. :}
}