Boyer, Robert Ernst,  1929- <br/><br/>
Aerial stereo studies :  to supplement Hybbard Aerial stereo photographs / 
Robert E. Boyer and P.B. Snyder 
 - Teacher's ed 
 - Northbrook, Ill.  Hubbard Press,  1970 
 - 48 p. ;  29 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aerial photography in geology<br/>Photography, Aerial<br/>Photography in geology<br/>Photography, Stereoscopic