@book{38342,
	author = {Peech, Michael. and Guanos y Fertilizantes de México, S. A. and English, L.},
	title = {Microanálisis rápidos de suelos para K, Mn, Fe, Al, P, N-(NH3) y N-(N03)},
	publisher = {Departamento Agronómico,},
	year = {1971},
	address = {México :},
	note = {c.4-9 en bodega}
}