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| Author | Title | Year | |
|---|---|---|---|
| 1. | Duckworth, H.E. | Bisects of the 6 cent large queen | 1974 |
| 2. | Milks, John E. | The use of x-ray fluorescence analysis to characterize printings of early Canadian stamps [1851-1897] | 1991 |
| 3. | Studd, M.A. | Canada, 1868 large cents issue; re-entries on the 6 cents value | 1930 |
| 4. | Trimble, R. | A 6c large queen re-entry | 1989 |
| 5. | Trimble, R. | The 5c on 6c small queen - Three distinctly different plate positions found... | 1990 |
| 6. | Trimble, R. | The major re-entry on the 6c large queen | 1992 |