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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Inscoe, May N., - Bushman, Donald William, - Ridgway, R. L. - United States. Agricultural Research Service.
    Publication info: [Beltsville, Md.?], U.S. Dept. of Agriculture, Agricultural Research Service, 1985
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Jones, Suzanne L - Ridgway, R. L.
    Publication info: New Orleans, Agricultural Research Service, U.S. Dept. of Agriculture, 1976
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Coppedge, James Roland, - Ridgway, R. L.
    Publication info: Washington, D.C, Agricultural Research Service, U.S. Dept. of Agriculture, 1973
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library