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| Author | Title | Year | |
|---|---|---|---|
| 11. | Walker, Lawrence A. | The Nova Scotia duplex postmarks | 1983 |
| 12. | Walker, Lawrence A. | The Manitoba duplex postmarks | 1983 |
| 13. | Walker, Lawrence A. | The Alberta duplex postmarks | 1984 |
| 14. | Walker, Lawrence A. | The Saskatchewan duplex postmarks | 1984 |
| 15. | Walker, Lawrence A. | B.C. duplex postmarks | 1985 |
| 16. | Walker, Lawrence A. | The Quebec duplex postmarks | 1985 |
| 17. | Walker, Lawrence A. | Ontario duplex postmarks | 1986 |
| 18. | Walker, Lawrence A. | The Quebec city duplex postmarks | 1986 |
| 19. | Felton, James | An update to Houser's British Columbia duplex list | 1984 |
| 20. | French, R. DeL. | Something for nothing | 1950 |