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| Author | Title | Year | |
|---|---|---|---|
| 1. | Canadian cancellations | 1939 | |
| 2. | Canada: list of numeral cancellations on issue 1855 to 1859 | 1943 | |
| 3. | Seven missing ringed numbers of Canada | 1943 | |
| 4. | Canada: the two ringed numeral obliterators of 1868 | 1943 | |
| 5. | Numeral cancellations | 1978 | |
| 6. | 2-ring cancellations | 1978 | |
| 7. | Barraclough, J. R. | Incomplete notes - 4 and 2 ring numeral cancellations | 1944 |
| 8. | Barraclough, J.R. | About Canadian numerals | 1950 |
| 9. | Barraclough, Reg. | Incomplete notes - help wanted | 1951 |
| 10. | Barraclough, Reg. | Four & two ringed numeral cancellations - early Canada | 1951 |