Sears, Paul Bigelow,  1891- <br/><br/>
Deserts on the march / 
Paul Bigelow Sears 
 - 3rd. rev. ed. 
 - Norman :  University of Oklahoma Press,  1959 
 - xiii, 178 p. :  ill. ;  21 cm. 
<br/><br/><label>LCCN: </label>63-025305 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources--United States<br/>Agriculture--United States