Blaker, Alfred A, b.1928 <br/><br/>
Field photography :  beginning and advanced techniques / 
Alfred A. Blaker 
 - San Francisco :  W. H. Freeman,  1976 
 - xxi, 451 p. :  ill. ;  24 cm. 
<br/><br/> Includes index 
<br/><br/>p. 431-440 
<br/><br/><label>ISBN: </label>0716705184 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nature photography