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  1. By: Stevens, Neil E. (Neil Everett), - Wilcox, R. B. (Raymond Boorman),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1918.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Stevens, Neil E. (Neil Everett), - Wilcox, R. B. (Raymond Boorman),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1917.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library