00373nam a2200133 a 450000500170000000800410001704100080005808200080006610000200007424500600009426400420015430000120019670000310020820260717091129.0260717s1981    ii            000 0 eng d  aeng04a6331 aMartin, John D.10aPrinciples of field crops production /cMartin, John D. 1aLondon :bCollier Mac- millan,c1981.  a1118 p.1 aWarren H. Leonard Deceased