Codes for cloud forms and states of the sky according to the international system of classification.  Prepared by the Weather bureau Committee on clouds and cloud forms: 
Ivan R. Tannehill, chairman, Horace R. Byers, Edgar B. Calvert [and others] 
 - Washington,  U.S. Govt. print off.,  1938. 
 - iv, 100 p.  illus., diagr.  23 cm. 
 - Its Circular S. .
<br/><br/> At head of title: W.B. no. 1249. U.S. Department of agriculture.   Weather bureau. 
<br/><br/><label>LCCN: </label>agr39000262  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clouds.
<br/><br/><label>LC Class. No.: </label>QC921  / .U6 1938