Ray, Richard G.  1920- <br/><br/>
Aerial photographs in geologic interpretation and mapping / 
by Richard G. Ray 
 - Washington :  U.S. Government Printing Office,  1960 
 - 230 p. :  ill. ;  29 cm. 
 - U.S. Geological Survey.  Professional paper ;  373 .
<br/><br/>Includes bibliographical references and indexes 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aerial photography<br/>Photographic surveying<br/>Geology--Maps