003230000a22001450004500060000800000082001600008100001600024100001700040100001700057245003900074260002600113260000900139300000800148650002100156  a100  a631.811 BAR  aBarber, S A  aCain, John C  aCarolus, R L  aHunger signs in crops: a symposium  aU S A, David Mckay Co  c1941  a461  aSoil fertilizers