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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Spencer, H. J. (Henry Jackson), - U.S. Fish and Wildlife Service
    Publication info: Chicago, Ill, United States Dept. of the Interior, Fish and Wildlife Service, 1944
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Spencer, H. J. (Henry Jackson), - U.S. Fish and Wildlife Service
    Edition: Rev. September 1950
    Publication info: Washington, D. C, U.S. Dept. of the Interior, Fish and Wildlife Service, 1950
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library