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| Author | Title | Year | |
|---|---|---|---|
| 1. | Arnold, Gary D. | The 1880 Ottawa squared circle | 1987 |
| 2. | Whitehead, Alfred | Rounding up squared circles | 1957-1987 |
| 3. | Banno, Edward C. | The Paris, Ontario squared circle | 1956 |
| 4. | Bayley, Colin H. | Some new squared circle proof dates | 1960 |
| 5. | Bayley, Colin H. | An early Ottawa squared circle precursor | 1981 |
| 6. | Bélanger, Ferdinand | The Pointe-à-Pic squared circle | 1982 |
| 7. | Boggs, Winthrop S. | Notes on the 'squared circle' postmarks of Canada | 1957 |
| 8. | Boggs, Winthrop S. | A brief note on the squared circle postmarks | 1971 |
| 9. | Bosch, Warren L. | The squared circle 'townfinder' | 1978 |
| 10. | Robert A. Lee Philatelist Ltd., Kelowna, B.C. | Public auction, Saturday, November 18th, 1989 featuring the award winning collection of Emerson A. Clark entitled 'Libations, liver pills and loose ends' and square circle collection and part II of the Norman Brassler squared circle collection | 1989 |