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| Author | Title | Year | |
|---|---|---|---|
| 1. | Hamilton, Patrick | Canadian issue abounding in re-entries: classic halfpenny is one hundred years old | 1957 |
| 2. | Lea, Michael | Canada - An amazing new discovery: the 1/2 d. deep rose on thin soft horizontal ribbed paper perforated 11.6 | 1966 |
| 3. | Trimble, R. | The major re-entry on the half penny | 1986 |
| 4. | Trimble, R. | Another major re-entry on the one half penny | 1991 |
| 5. | Trimble, R. | An abundance of major re-entries on the one half penny | 1993 |
| 6. | Watt, Jim | The major re-entry on the one half penny - revisited | 1986 |