UNITED STATES DEPARTAMENT OF AGRICULTURE <br/><br/>
Soil. The Yearbook of agriculture 1957  

 - Washington  The United States Government Printing Office  1957 
 - 784 p. 
 - 85 Th Congress, IST SESSION, House Document Nš30  .
<br/><br/><label>Subjects--Topical Terms: </label><br/>SUELOS<br/>AGRICULTURA
<br/><br/><label>Universal Decimal Class. No.: </label>631.4 UNI