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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Weigel, C. A. (Charles Adolph) - Sanford, Herbert Luther,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1920
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Weigel, C. A. (Charles Adolph) - United States. Bureau of Entomology. - WRC (Radio station : Washington, D.C.)
    Publication info: [Washington, D.C.], [United States Department of Agriculture, Bureau of Entomology], [1931]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Weigel, C. A. (Charles Adolph) - Baumhofer, Lynn Garfield,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1948
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Weigel, C. A. (Charles Adolph)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library