00385    a2200109   4500082001700000245008900017260005400106300001700160650001000177650003100187650005700218  a631.521bSEE  aSeed vigor testing handbook bcontribution No. 32b to the handbook on seed testing   bAssociation of Official Seed Analystsc1983g1983  ax,86p.c30cm  aSeeds  aCultivation and harvesting  aSpecific techniques:apparatus, equipment, materials