Interpreting the environment / 
edited by Grant W. Sharpe. 
 - New York :  Wiley,  c1976. 
 - xvi, 566 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0471778966 (cased.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural history--Study and teaching.<br/>Nature study.<br/>Park rangers.<br/>National parks and reserves.