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| Author | Title | Year | |
|---|---|---|---|
| 11. | National Postal Museum | National Postal Museum acquires historic military roller cancelling device | 1987 |
| 12. | Pelletier, N. A. | Roller cancels | 1965 |
| 13. | Reiche, Hans | Montreal 21 roller cancellation | 1988 |
| 14. | Rossister, John | Registered rollers | 1979 |
| 15. | Smythies, E. A. | Rollers used as precancels | 1966 |
| 16. | Smythies, E. A. | The evolution of the Canadian roller cancellations | 1966 |
| 17. | Smythies, E. A. | Roller cancellations | 1967 |
| 18. | Smythies, E. A. | Canadian roller cancellations | 1967 |
| 19. | Smythies, E. A. | Roller corner | 1970-1972 |
| 20. | Smythies, E.A. | Puzzling Canadian roller cancellations | 1976 |