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Please read BHL's Acknowledgment of Harmful Content
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  1. By: United States. Department of Agriculture.
    Publication info: [Washington, D.C.], U.S. Dept. of Agriculture, 1989
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Biological control  Insect pests  Insects  plant pathogens  United States  USDA  vectors  
  2. By: United States. Department of Agriculture.
    Publication info: [Washington, D.C.], U.S. Dept. of Agriculture, 1988
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Soil conservation  USDA  Water conservation  Wildlife management