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| Author | Title | Year | |
|---|---|---|---|
| 11. | Richardson, Ed. | When was 1/2c Canada queen first used | 1963 |
| 12. | Searles, Geo. R. C. | A study of the re-entries and retouches of the half cent small head | 1953 |
| 13. | Stulberg, Fred | The wide and narrow stamps of the 1/2 small queen | 1969 |
| 14. | Stulberg, F.G. | The half cent rates of Canada | 1973-1974 |
| 15. | 'The Yellow Peril' (pseud) | A secular rate | 1989 |
| 16. | Trimble, R. | 1/2c S.Q. imprint - not a re-entry after all! | 1988 |
| 17. | Trimble, R. | S.Q. corner - A major re-entry on the 1/2c | 1988 |
| 18. | Trimble, R. | S.Q. corner - Another major on the 1/2c | 1989 |
| 19. | Trimble, R. | The major re-entry on the 1/2c small queen, 1R49 - Revisited | 1992 |
| 20. | Trimble, R. | A runner-up to the major re-entry on the 1/2c S.Q. | 1993 |