003390000a22001330004500060000800000082001700008100002100025100001900046245004800065260002200113260000900135300000700144650005400151  a100  a635.0423 HAR  aHarbhajan, Singh  aVishnu, Swarup  aExploitation of hybrid vigour in vegetables  aNewdelhi, I C A R  c1962  a47  aVegetables- Hybrid Vigour/ Hybrid seed production