00281nam a2200109Ia 450000500170000000800410001708200120005810000220007024500290009226000420012130000080016320260225051024.0260224s9999||||xx |||||||||||||| ||und||  a632 DIC  aJames G. Dickson  0aDiseases of field crops   aNew York: McGraw-Hill Book Co. c1596  a517