Major statistical series of the US Department of Agriculture  : how they are constructed and used  Volume 2  Agricultural production and efficiency 
US Department of Agriculture 
 - Washington  USDA  1970 
 - 40 p.  26 cm 
 - Agriculture Handbook / USDA  2 .
 - Agriculture Handbook / USDA Agricultural production and efficiency .
<br/><br/><label>Subjects--Index Terms: </label>Eua Datos estadisticos Economia agricola