00284nam a2200121Ia 4500082001800000100001900018245004400037260000900081300001600090490001500106490003600121500000500157  a330.183 J67b  aJohnson, G. L.  aState of agricultural supply analysisb  c1960  app. 435-452  vMarch 1960  aJournal of farm economics, v.42  a