003140000a22001210004500060000800000082001800008100002300026245002700049260004400076260000900120300000800129650005500137  a100  a630.  685 PEA  aPearson, Lorentz C  aPrinciples of agronomy  aNewyork, Reinholdpublishing Corporation  c1967  a423  aAgronomy/crop rotation/weed management/fiber crops