Soil 

 - xiii, 784 páginas :  fot. 
<br/><br/> "85 th. congress, 1st. secsion, house document No. 30" 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos.
<br/><br/><label>LC Class. No.: </label>S591  / U5 1957