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| Author | Title | Year | |
|---|---|---|---|
| 1. | Hogg, C. Leigh | Half cent maple leaf | 1977 |
| 2. | Jarrett, Fred | Canada 1/2c four leaf, 1897 | 1954 |
| 3. | Kershaw, Kenneth A. | Plating the more distinctive re-entries in the half cent maple leaf stamp | 2006 |
| 4. | Sanders, H. | The half cent. Maple leaves of Canada, 1897 | 1962 |
| 5. | Trimble, R. | Major re-entries on the half cent maple leaf | 1990 |
| 6. | Whitehead, Alfred | The half cent, maple leaves of Canada, 1897 | 1945 |