Soil conservation practices and crop production in the blacklands of texas 

 - Agricultural Research Service  US  1971 
 - 23p.  fig., table, chart 
<br/><br/><label>Nat. Bib. No.: </label>4024 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>Universal Decimal Class. No.: </label>631.45  / SOI