Turk, J.  (PhD) <br/><br/>
Introduction to environmental studies/ 

 - 2nd ed. 
 - Philadelphia  Saunders College Publishing  1985 
 - xiv; 330p.  ills. 
<br/><br/><label>ISBN: </label>0030114683 
<br/><br/><label>LC Class. No.: </label>QH541  / .T84 1985