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Book dossier
by United States. Animal and Plant Health Inspection Service
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Witchweed ... agricultural survey
United States. Animal and Plant Health Inspection Service. Plant Protection and Quarantine Programs
Witchweed
United States. Animal and Plant Health Inspection Service.
Witchweed-- agricultural survey
Witchweed research and control in the United States
Paul F. Sand
Watch out for witchweed
United States. Animal and Plant Health Inspection Service.
Watch out for witchweed, a serious pest of corn, sorghum, and other crops
United States. Animal and Plant Health Inspection Service. Plant Protection and Quarantine Programs