002860000a22001210004500060000800000082001800008100002100026245002800047260004500075260000900120300000800129650002700137  a100  a633.089 3 DIC  aDickson, James G  aDiseases of field crops  aNew York, Mc Graw- Hill Book Company Inc  c1947  a429  aDiseases - field crops