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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Neff, Johnson A. (Johnson Andrew), - U.S. Fish and Wildlife Service
    Edition: Rev.
    Publication info: Washington, D.C, U.S. Dept. of the Interior, Fish and Wildlife Service, 1948
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Neff, Johnson A. (Johnson Andrew), - United States. Bureau of Biological Survey. - U.S. Fish and Wildlife Service
    Publication info: Washington, D.C, U.S. Dept. of the Interior, Fish and Wildlife Service, 1936
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library