00505    a2200157   4500082001700000100001400017245002000031260007000051300001700121440004000138650003300178650006000211650003100271700001600302700002900318  a631.523bAYA  aAyad, G.   aCereals bmaize  aRomebInternational Board for Plant Genetic Resourcesc1980g1980  ai,24p.c28cm  aDerectory of germplasm collections   aDevelopment of new varieties  aproduction of propagational organisms and new varieties  acultivation and harvesting  aToll, Jane   aEsquinas-Alcazar, J. T.