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| Author | Title | Year | |
|---|---|---|---|
| 1. | Canada - 5/6c re-entry on 6c small queen | 1954 | |
| 2. | The small cents - the six cents double entry | 1956 | |
| 3. | Arfken, George B. | The most remarkable variety of Canadian stamps [5˘ on 6˘ small queen re-entry] | 1985 |
| 4. | Simpson, William L. | The 6˘ small queen essay | 1991 |
| 5. | Blois, E. M. | Small queens: 5c re-entry on 6c. | 1954 |
| 6. | Boggs, Winthrop S. | 19th century American plate production - Canada: the 5c entry on the 6c 'small queen' plate | 1959-1960 |
| 7. | Bonar, J. | The problem of the 6 cents | 1951 |
| 8. | Hillson, N.J.A. | The six cents small queen 1872-1897 | 1983 |
| 9. | Hillson, John | Small queens - the enigma variations, an update | 1990 |
| 10. | Hillson, John | The lesser 5c on 6c small queen varieties | 1993 |