000 00324nam a2200121Ia 4500
001 MPKV108048
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082 _a632.5
245 _aWeed Research Vol 20-21
_c;
246 _aWeed Research Vol 11
260 _aEngland
_bBlackwell Scientific Publ.
_c1980-81
650 _aWeed Science
999 _c71406
_d71406