Deserts and steppes. 
Steppe ecology. Desert ecology. 
 - 1st ed. 
 - New York:  Britannica Educational,  2011. 
 -  hbk; 234p. 
<br/><br/><label>ISBN: </label>9781615303175 
<br/><br/><label>Dewey Class. No.: </label>551.415 DESE