@book{13524,
	author = {Kilford, W.K.},
	title = {Elementary air survey /},
	publisher = {Pitman,},
	year = {1975.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/B007ZK59W2/chopaconline-20}
}