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| Author | Title | Year | |
|---|---|---|---|
| 11. | Robert A. Lee Philatelist Ltd., Kelowna, B.C. | Public auction, Saturday, September 9th, 1989 featuring [the John Thomson Eastern Arctic mail, part II and the Norman Brassler squared circle collections] | 1989 |
| 12. | Brown, Paul L. | Mount Brydges squared circle postmark | 1960 |
| 13. | Campbell, Frank W. | A useful heavy postmark [ Schreiber/Port Arthur, Ont. ] | 1954 |
| 14. | Felton, Jim | Update on the 1880 Ottawa squared circle | 1985 |
| 15. | Carstairs, M. W. | The Montreal barred circles | 1967 |
| 16. | Catterick, James W. | More 'squared circles' | 1953 |
| 17. | Chaplin, R.A. | The barred circle postmarks of Canada and Newfoundland | 1970 |
| 18. | Cohen, S. F. | A new squared circle discovery - two hammers for Wolseley, Assa | 1971 |
| 19. | Harrison, Horace W. | Numeral cancels on the 1868 large Queen issue | 1959-1963 |
| 20. | Cooke, Lorna | Squared circle postmarks | 1956 |