System theory applications to agricultural modelli 

 - Washington  Govt Press           1978 
 - 70p.  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture Labour
<br/><br/><label>Dewey Class. No.: </label>X9(J):(B).73.N7, L8