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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Daum, R. J. - United States. Animal and Plant Health Inspection Service. Plant Protection and Quarantine Programs.
    Publication info: [Washington], Plant Protection and Quarantine Programs, Animal and Plant Health Inspection Service, U.S. Dept. of Agriculture, 1976
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library