@book{206999,
	author = {Beckwith, M.H. and Delaware. Agr. Exp. Sta. Bulletin; 30},
	title = {The San Jose Scale insect present status of the San Jose Scale in Delaware status of the insect in the United States  /},
	publisher = { Agricultural Experiment Station},
	address = {Newark, Del. :},
	note = {Encuadernado con otros impresos similares}
}