Agriculture and the environment : the 1991 yearbook of agriculture  

 -  U.S. Department of Agriculture  1991 
<br/><br/>23670 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture - United States<br/>Agricultural ecology - United States<br/>Agriculture and state - United States
<br/><br/><label>LC Class. No.: </label>S  / 21