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  1. By: Cole, John S. (John Selden), - Mathews, O. R. (Oscar Roland),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1940
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Mathews, O. R. (Oscar Roland), - Clark, Verner I. (Verner Ivan),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1937
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Mathews, O. R. (Oscar Roland), - Chilcott, E. C. (Ellery Channing),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1923
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Cole, John S. (John Selden), - Mathews, O. R. (Oscar Roland), - Chilcott, E. C. (Ellery Channing),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1923
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  5. By: Mathews, O. R. (Oscar Roland),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library