00280nam a2200109Ia 450000500170000000800410001708200120005810000180007024500320008826000420012030000080016220260224040841.0260224s9999||||xx |||||||||||||| ||und||  a635 WAL  aWalker, J.C.  0aDiseases of vegetable crops  aNew York: Mc-Graw-Hill Book Co.c2004  a529