Barger, Harold and Landsberg, H. H. <br/><br/>
American agriculture, 1899-1939  a study of output, employment and productivity 

 - New York  NBER  1942 
 - xxii, 440p. 
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>338.10973  / B251.AA