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| Author | Title | Year | |
|---|---|---|---|
| 1. | 28 broken circles used in the year 1935 in the electoral district of Nipissing, Ontario | 1981 | |
| 2. | Allen, D.J. | Broken circles of Alberta | 1975-1976 |
| 3. | Bélanger, Ferdinand | Hôtel Roberval | 1981 |
| 4. | Bélanger, Ferdinand | Les cercles interrompus | 1983 |
| 5. | Bélanger, Ferdinand | Le timbre à date "Q" | 1984 |
| 6. | Macpherson, L. B. | Nova Scotian postmarks: unreported hammers | 1983 |
| 7. | Campbell, Frank W. | Why the 1830 era covers are seldom seen | 1948 |
| 8. | Campbell, Frank W. | The 1839 two part circle handstamps | 1977 |
| 9. | Campbell, Frank W. | An instrument order | 1978 |
| 10. | Campbell, Frank W. | Starting dates of postmarks styles | 1978 |