Sears P B <br/><br/>
Deserts on the march 

 -  1949 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>47386 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Dynamic geology<br/> Epigene<br/>Geology
<br/><br/><label>Dewey Class. No.: </label>H42, H9