@book{50511,
	author = {Torres R., Edmundo. and Oria Ramos, Pedro Ricardo.},
	title = {El cultivo del trigo en el norte de Coahuila},
	publisher = {Campo Experimental de Zaragoza,},
	year = {(s.a.)},
	address = {(s.l.) :},
	note = {Hoja desplegable}
}