Brock, G. C. <br/><br/>
Image evaluation for aerial photography :  an appraisal of current techniques / 
G.C. Brock. 
 - London :  Focal Press,  1970. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Photographic optics.<br/>Photographic interpretation.<br/>Photography, Aerial.