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  1. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: Lincoln, Neb, 1916
    Holding Institution: University of Toronto - Earth Sciences Library (Noranda)
  2. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: Lincoln, Neb, 1916
    Holding Institution: University of British Columbia Library
  3. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: Lincoln, Neb, 1916
    Holding Institution: Cornell University Library
  4. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: New York, The Macmillan Company, 1918
    Holding Institution: Multiple institutions
  5. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: New York, The Macmillan company, 1920
    Holding Institution: University of British Columbia Library
  6. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: New York, Macmillan, 1918
    Holding Institution: University of Toronto - Robarts Library
  7. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: New York, The Macmillan Company, 1918
    Holding Institution: University of California Libraries
  8. By: Boerker, Richard H. D. (Richard Hans Douai),
    Publication info: New York, The Macmillan company, 1918
    Holding Institution: Library of Congress