@book{207288,
	author = {Pettit, R. H. and Michigan. agri. Exp. Sta. Press Bull.; 69},
	title = {Cockscomb gall of elmi  /},
	publisher = { Michigan agricultural College. agricultural Experiment Station},
	address = {East Lansing, Mich. :},
	note = {Encuadernado con otros impresos similares}
}