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| Author | Title | Year | |
|---|---|---|---|
| 11. | Jaffé, Hans H. and R. E. Kuntz | Canada | 1980 |
| 12. | Jamieson, John | Canadian imperfs - Part IV - the imperf coils | 1990 |
| 13. | Montgomery, J.A. | Catalogues neglect Canada's long line of coils | 2005 |
| 14. | Patrick, Douglas | Unravelling the intricate subject of our coil postage | 1973 |
| 15. | Pollock, F. Walter | Printing varieties in Canadian coil stamps | 1954 |
| 16. | Powell, E. C. | Canada - Booklets coils & straight edges | 1953 |
| 17. | Reiche, Hans. | The coil jumps - authentic information on the reasons behind this 'variety' | 1954 |
| 18. | Talman, John H. | New imperf coils show promise [ 10 cent ] | 1976 |
| 19. | Toop, E.R. | Canada's test coils of the 1960s | 1988 |
| 20. | Whiting, Edward J. | The coil postage stamps of Canada | 1953-1954 |