@book{9660,
	author = {United States.},
	title = {Instructions for airway meteorological service.},
	publisher = {U.S. Govt. print. off.,},
	year = {1935.},
	series = {Circular N},
	address = {Washington,},
	edition = {Third edition.  1935.},
	note = {At head of title: U. S. Department of agriculture.  Weather bureau.}
}