Foster, A. B. <br/><br/>
Approved practices in soil conservation. 

 - 4. ed. 
 - Danville (USA):   Interstate,   1973.  
 - 497 p. 
<br/><br/> 130 illus; Glossary, p.469 - 494 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservação do solo