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| Author | Title | Year | |
|---|---|---|---|
| 1. | Gutzman, Wally | Oval postmarks: parcel post of Q.V. era | 1986 |
| 2. | Olson, George T. | Notes on oval cancel of the small queens era. 3rd. edition | 1983 |
| 3. | Parsons, Bob | The Colborne, U.C., double oval | 1988 |
| 4. | Rosenthal, Max. | Parcel post: oval postmarks | 1970 |
| 5. | Rosenthal, Max. | Canada's parcel post ovals | 1972-1973 |
| 6. | Stulberg, Fred | The Legislative Assembly, Canada oval | 1974 |