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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Robotka, Frank,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1923
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Mason, Burton B., - Robotka, Frank, - Swarthout, A. V. (Arthur Vance),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1919
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library