00336nam a2200109Ia 4500082002300000100004000023245008400063260002500147300001600172500000500188700003300193  a338.10973bB251.AA  aBarger, Harold and Landsberg, H. H.  aAmerican agriculture, 1899-1939ba study of output, employment and productivity  aNew YorkbNBERc1942  axxii, 440p.  a  aLandsberg, H. H. ; jt. auth.