Bear, Firman E. (Firman Edward), 1884-1967 <br/><br/>
Earth :  the stuff of life / 
by Firman E. Bear second edition, revised by H. Wayne Pritchard and Wallace E. Akin 
 - 2nd. ed. 
 - Norman :  University of Oklahoma Press,  1986 
 - 318 p. :  ill., maps ;  22 cm. 
<br/><br/>p. 303-308 
<br/><br/><label>ISBN: </label>0806120029 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils<br/>Soils--United States<br/>Soils conservation<br/>Soils conservation--United States