Heady E O <br/><br/>
Resource productivity returns to scale and farm size 

 - Ames  Lowa The lowa State College Press       1956 
 - 208p  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>X9(J):8.73.N5, J6