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  1. By: Mills, Ernest M. - 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,1938.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Mills, Ernest M. - 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,1938.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library