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| Author | Title | Year | |
|---|---|---|---|
| 11. | Bentham, Lorne Wm. | From 1958-66 - more on Canada's secret marks | 1979 |
| 12. | Bentham, Lorne Wm. | More on Canada's hidden dates | 1980 |
| 13. | 'Cada' (pseud.) | Canadian secret dates and hidden marks | 1956 |
| 14. | Cummings, Melanie | Plates preserve precious parts of philatelic past [American Bank Note Company] | 2006 |
| 15. | Delimbeuf, Marcel | Devinettes canadiennes [date cachée] | 1993 |
| 16. | Dodson, Jr., Geo. L. | 'Hidden' dates on Canadian stamps | 1957 |
| 17. | Faunthorpe, C. L. | Canadian secret dates | 1951 |
| 18. | Hamilton, Ben. Jr. | Stamp designs of Canada - with special reference to the later pictorials | 1935-1938 |
| 19. | Hannah, J. | Admiral notebook | 1982 |
| 20. | Hillson, John | Small queens - guide lines, position dots & things | 1984 |