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| Author | Title | Year | |
|---|---|---|---|
| 11. | Brandt, Jack | Canadian revenue perfins | 1977 |
| 12. | Campbell, Frank W. | Canada 'perfins' | 1953 |
| 13. | Dalpé, Jean-Guy | Les timbres perforés canadiens | 1976 |
| 14. | Dalpé, Jean-Guy | Checklist of stamps punched by companies in the province of Quebec | 1981 |
| 15. | Dalpé, Jean-Guy | Les «perforés» du Québec: second regard | 1983 |
| 16. | Dicketts, Michael | Canadian users who remain unidentified | 1979 |
| 17. | Dicketts, Michael | Canadian revenue perfins | 1980 |
| 18. | Dicketts, Michael | Covers corner | 1980 |
| 19. | Dicketts, Michael | What's behind the name | 1981 |
| 20. | Dicketts, Michael | Caveat emptor | 1986 |