@book{70918,
	author = {Calzada Nava, Alberto.},
	title = {Manual de prácticas forestales.},
	publisher = {UACH. Departamento de Bosques,},
	year = {1981.},
	series = {UACH. Departamento de Bosques. Boletín técnico},
	address = {Chapingo, Méx. :},
	note = {c.4 en bodega}
}