@book{9937,
	author = {U. S. Weather Bureau.},
	title = {Codes for cloud forms and states of the sky according to the international system of classification.},
	publisher = {U.S. Govt. print off.,},
	year = {1938.},
	series = {Its Circular S.},
	address = {Washington,},
	note = {At head of title: W.B. no. 1249. U.S. Department of agriculture.   Weather bureau.}
}