Interpreting the environment / 
edited by Grant W. Sharpe 
 - 2d ed 
 - New York :  Wiley,  1982 
 - 694 p.  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and indexes 
<br/><br/><label>LCCN: </label>81-010391 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural history--Study and teaching<br/>Nature study<br/>Park rangers<br/>National parks and reserves