@book{2800,
	author = {Nava Sánchez, Miguel Angel.},
	title = {Diagnóstico fitosanitario de trigo (Triticum sativum L.) sembrado bajo labranza de conservación en Valle de Santiago, Gto.},
	publisher = {El autor,},
	year = {1991},
	address = {Chapingo, Méx. :},
	note = {D47-92}
}