Soil : the yearbook of agriculture 1957 / 
United States Department of Agriculture. 
 - U.S.D.A. :  Forest Service,   1957. 
 - xiii, 784 p. :  ill. ;  23 cm 
<br/><br/>Includes Index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil science.
<br/><br/><label>Dewey Class. No.: </label>631.4  / UNS 1957