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| Author | Title | Year | |
|---|---|---|---|
| 11. | Bileski, K. | Canada: the 2c 1963 overprint errors | 1965 |
| 12. | Cole, C. L. | [A study of the 1963 G overprints] | 1967 |
| 13. | Dilworth, Harold M. | Canadian officials - a new spacing variety [1954 - 5c regular] | 1965 |
| 14. | Forest, Jean-Pierre | Un "G" pas comme les autres | 1979 |
| 15. | Jackson, Wm. T. | Canada's scarcest modern stamps | 1955 |
| 16. | Jackson, Wm. T. | What is new in Canadian official plate blocks | 1957 |
| 17. | Keighley, B. M. | Canadian 'G' overprint error | 1952 |
| 18. | Keighly, B.M. | Canadian rarity [ official 10c fur industry ] | 1952 |
| 19. | Reiche, Hans | Canadian notes | 1955 |
| 20. | Richardson, Ed. | Canadian officials - the missing 'G' overprint | 1959 |