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  1. By: Clark, George H. (George Harold), - Fletcher, James - Canada. Department of Agriculture.
    Edition: 2nd ed. / rev. and enl. by George H. Clark.
    Publication info: Ottawa, Govt. Print. Bureau, 1909
    Holding Institution: Canadiana.org
  2. By: Clark, George H. (George Harold), - Fletcher, James - Criddle, Norman, - Canada. Branch of the Seed Commissioner.
    Publication info: Ottawa, Dept. of Agriculture, Branch of the Seed Commissioner, 1906
    Holding Institution: Internet Archive
  3. By: Canada. Department of Agriculture. - Clark, George H. (George Harold), - Fletcher, James
    Publication info: Ottawa, Published by direction of the Hon. S. A. Fisher, Minister of Agriculture, 1906
    Holding Institution: University of Toronto - St. Michael’s College (John M. Kelly Library)
  4. By: Clark, George H. (George Harold), - Fletcher, James - Canada. Department of Agriculture.
    Edition: 2nd ed., rev. and enl. /
    Publication info: Ottawa, Dept. of Agriculture, 1923
    Holding Institution: University of Toronto - Earth Sciences Library (Noranda)
  5. By: Clark, George H. (George Harold), - Fletcher, James - Criddle, Norman, - Canada. Department of Agriculture.
    Publication info: Ottawa, Published by direction of the Minister of Agriculture, 1906
    Holding Institution: ASC - York University Libraries
  6. By: Canada. Department of Agriculture. - Clark, George H. (George Harold), - Fletcher, James
    Edition: 2d ed., rev. and enl. by George H. Clark.
    Publication info: Ottawa, Govt. Print. Bureau, [1909]
    Holding Institution: University of California Libraries
  7. By: Canada. Department of Agriculture. - Clark, George H. (George Harold), - Fletcher, James
    Publication info: Ottawa, Pub. by direction of the Hon. S. A. Fisher, Minister of Agriculture, 1906
    Holding Institution: University of California Libraries
  8. By: Canada. Department of Agriculture. - Clark, George H. (George Harold), - Malte, M. O. (Malte Oscar),
    Publication info: Ottawa, F.A. Acland, Printer, 1923
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  9. By: Clark, George H. (George Harold), - Malte, M. O. (Malte Oscar), - Canada. Department of Agriculture.
    Publication info: Ottawa, Minister of Agriculture, 1913
    Holding Institution: Cornell University Library
  10. By: Clark, George H. (George Harold), - Malte, M. O. (Malte Oscar), - Canada. Department of Agriculture.
    Publication info: Ottawa, Govt. Print. Bureau, 1913
    Holding Institution: Canadiana.org
  11. By: Clark, George H. (George Harold), - Malte, M. O. (Malte Oscar), - Canada. Department of Agriculture.
    Publication info: Ottawa, Dept. of Agriculture, Canada : available at the Office of the Superintendent of Stationery, Government Printing Bureau, 1913
    Holding Institution: University of Toronto - Earth Sciences Library (Noranda)
  12. By: Canada. Department of Agriculture. - Malte, M. O. (Malte Oscar), - Clark, George H. (George Harold),
    Publication info: Ottawa, Govt. Print. Bureau, 1913
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  13. By: Clark, George H. (George Harold), - Malte, M. O. (Malte Oscar), - Canada. Department of Agriculture.
    Publication info: Ottawa, Minister of Agriculture, 1913
    Holding Institution: University of California Libraries
  14. By: Clark, George H. (George Harold), - Fletcher, James - Canada. Department of Agriculture. Seed Division. - Canada. Department of Agriculture. Seed Division.
    Edition: 2e éd., revue et agrandie / par George H. Clark.
    Publication info: Ottawa, Impr. du gouvernement, 1909
    Holding Institution: Canadiana.org
  15. By: Clark, George H. (George Harold), - Fletcher, James - Canada. Department of Agriculture.
    Publication info: Ottawa, Ministère de l'agriculture, 1906
    Holding Institution: Canadiana.org
  16. By: Clark, George H. (George Harold), - Malte, M. O. (Malte Oscar), - Canada. Department of Agriculture.
    Publication info: Ottawa, Impr. du gouvernement, 1913
    Holding Institution: Canadiana.org
  17. By: Clark, George H. (George Harold), - Malte, M. O. (Malte Oscar), - Canada. Department of Agriculture.
    Publication info: Ottawa, Ministre de l'Agriculture, 1913
    Holding Institution: Scott - York University Libraries
  18. By: Clark, George H. (George Harold), - Canada. Department of Agriculture. Seed Branch.
    Edition: [Rev. ed.]
    Publication info: Ottawa, Dept. of Agriculture, 1914
    Holding Institution: Canadiana.org
  1. By: Clark, George H. (George Harold),
    Type: Article
    In: The Ottawa naturalist
    Volume: 22
    Issue: 5
    Date: 1908-08
    Page Range: 102--104
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  2. By: Clark, George H. (George Harold),
    Type: Article
    In: The Ottawa naturalist
    Volume: 24
    Issue: 3
    Date: 1910-06
    Page Range: 57--58
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,