Gray, William R.  <br/><br/>
Powers Of Nature / 
William R. Gray and Tee Loftin 
 - Wastington D.C,  Special Publications Division :  1978. 
 - 199 Pages :  hbk.  26 cm. 
<br/><br/> Includes Index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography
<br/><br/><label>Dewey Class. No.: </label>500  / GRA