Resource productivity, returns to scale, and farm size / 
edited by Earl O. Heady, Glenn L. Johnson & Lowell S. Hardin 
 - Ames :  Iowa State College Press ,  1956 
 - xi, 208p. :  ill. ;  20 cm.  
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture<br/>Productivity accounting<br/>Research<br/>Farm management
<br/><br/><label>Dewey Class. No.: </label>631  / HEA