@book{56502,
	author = {Sims, Brian G.},
	title = {Conceptos y prácticas de cero labranza en maíz para el pequeño agricultor},
	publisher = {INIA. Campo Agrícola Experimental Cotaxtla,},
	year = {(1984)},
	address = {Veracruz, Ver. :},
	note = {Fotocopia}
}