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| Author | Title | Year | |
|---|---|---|---|
| 1. | Canadian cover 'mystery': 'crown' cancellations: genuine or fake? | 1966 | |
| 2. | Richardson, Ed. | Canadian crown cancellations | 1960 |
| 3. | Robertson, Ian S. | Ontario legislative post office metal "crown" hammer replaced | 1987 |
| 4. | Smythies, E. A. | The B. C. crown cancellation | 1963 |
| 5. | Smythies, E.A. | The Ottawa crown cancellation and its forgeries | 1963 |
| 6. | Smythies, E. A. | The Ottawa crown cancellations of 1880 | 1964 |
| 7. | Smythies, E. A. | Ottawa and B. C. crown cancellations | 1966 |
| 8. | Stulberg, Fred | The Ottawa crown - true or false | 1971 |
| 9. | 'The Yellow Peril' (pseud.) | Ottawa crown postmark | 1983 |