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  1. By: Curtis, Robert S. (Robert Seth),
    Edition: 2d ed.
    Publication info: Philadelphia and New York, Lea & Febiger, 1920
    Holding Institution: University of California Libraries
  2. By: Curtis, Robert S. (Robert Seth),
    Publication info: Philadelphia, Lea & Febiger, 1915
    Holding Institution: Library of Congress
  3. By: Curtis, Robert S. (Robert Seth),
    Publication info: Philadelphia, Lea & Febiger, 1915
    Holding Institution: Cornell University Library
  4. By: Curtis, Robert S. (Robert Seth),
    Publication info: Philadelphia, Lea & Febiger, c1915
    Holding Institution: NCSU Libraries
  5. By: Curtis, Robert S. (Robert Seth),
    Edition: 2d ed. illustrated with 190 engravings.
    Publication info: Philadelphia, Lea & Febiger, 1920
    Holding Institution: Library of Congress
  6. By: Ward, W. F. (William Francis) - Curtis, Robert S. (Robert Seth), - Peden, Fred Taylor,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1918
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  7. By: Farley, Frank W. (Frank Webster), - Peden, Fred Taylor, - Curtis, Robert S. (Robert Seth),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1921
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Wolf, Frederick A. (Frederick Adolph), - Curtis, Robert S. (Robert Seth), - Kaupp, B. F. (Benjamin Franklyn),
    Type: Article
    In: Technical bulletin
    Volume: 15
    Series: Technical bulletin (North Carolina Agricultural Experiment Station)
    Date: 1918
    Page Range: 1--85
    Publication Info: Raleigh, The Station,