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| Author | Title | Year | |
|---|---|---|---|
| 1. | Harding, David | Province of Saskatchewan official perfins | 1982 |
| 2. | Johnson, Jonathan | Province of Saskatchewan - a history of perforated initials in the Provincial Treasury | 1978 |
| 3. | Johnson, Jonathan | Province of Saskatchewan perfins | 1979 |
| 4. | Murray, G. Douglas | The PEI perforator | 1979 |
| 5. | Nelson, J. S. | Ontario Government office in London | 1970 |
| 6. | Richardson, Ed. | Other Canadian official perfins - Provincial issues | 1956-1957 |
| 7. | Tomasson, Gary D. | One other provincial official [Ontario Government - Ontario House in London, England] | 1981 |