00506nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067082001800076110003600094245014000130260001800270300001000288650005000298Para_7534CHAP220125s1971    xx            000 0 und d  a206461  cCHAP  aPA 632.58 W47  aWeed Science Society of America  aDirectory of personnel engaged in weed science :b United States, Canada, Puerto Rico, México  /c by Weed Science Society of America  as.l. :b s.e.  a95 p.  aMalas hierbas x investigaciónxdirectorios