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100   $a20030910d1979----km-y0itay50------ba
101 0 $aeng
200 1 $a<<The >>Biology of Canadian weeds$econtributions 1-32$epublication 1963
210   $aOttawa$c...$d1979
215   $a380 p.$d25 cm
300   $aEstr. da: Canadian Journal of Plant Science.
610 0 $aPiante infestanti
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996   $aBiology of Canadian weeds$9372845
997   $aUNINA