@book{206944,
	author = {Webster, R.L. and New York Agr. Exp. Sta.; Bull.; 523},
	title = {Fumigation with hydrogen cyanide for control of pear psylla  /},
	publisher = { Agricultural Experiment Station},
	address = {Geneva, N.Y. :},
	note = {Encuadernado con otros impresos similares}
}