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| Author | Title | Year | |
|---|---|---|---|
| 1. | International Harvest Co. [list of issues reported] | 1987 | |
| 2. | Behm, Michael | The Mutual Life perforator | 1988 |
| 3. | Behm, Mike | Dig out your Canadian and try to help Mike Behm in this study [International Harvester Company of America, I3 perforator] | 2001 |
| 4. | Ribler, Ronald I. | Canada's first four perfins: the very scarce small queen issues | 1999 |
| 5. | Benningen, Jack | Perfin design type T.5 - TP & T | 1978 |
| 6. | Benningen, Jack | B.10, B10a and sub. varieties - Bell Telephone Co. | 1985 |
| 7. | Benningen, Jack | Perfin no. C-12 - International Harvester Co. of Canada Ltd. | 1980 |
| 8. | Benningen, Jack | Ogilvy Flour Mills branch perfins - some new discoveries | 1985 |
| 9. | Benningen, Jack | The Swift Canadian Company (S4) | 1989 |
| 10. | Brandt, Jack | Canada C14 (CIL) | 1979 |