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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Cotton, R. T.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1922
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Back, E. A. (Ernest Adna), - Cotton, R. T.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Back, E. A. (Ernest Adna), - Cotton, R. T.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Back, E. A. (Ernest Adna), - Cotton, R. T.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1935
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  5. By: Back, E. A. (Ernest Adna), - Cotton, R. T.
    Edition: Rev.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, [1937]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  6. By: Back, E. A. (Ernest Adna), - Cotton, R. T. - United States. Department of Agriculture.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1942
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  7. By: United States. Bureau of Entomology and Plant Quarantine. - Cotton, R. T. - Walkden, H. H. (Herbert Halden),
    Publication info: [S.l.], Bureau of Entomology and Plant Quarantine, Agricultural Research Administration, U.S. Dept. of Agriculture, 1952
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  8. By: Cotton, R. T. - Wagner, George B., - United States. Bureau of Entomology and Plant Quarantine.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, December 1935
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library