@book{27283,
	author = {Kellogg, Charles E.},
	title = {Soil classification as the basis for a sound agriculture.},
	publisher = {Comité Permanente de la Segunda Conferencia Interamericana de Agricultura,},
	year = {1944.},
	series = {Publicaciones. Sección 2A},
	address = {México, D. F. :}
}