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| Author | Title | Year | |
|---|---|---|---|
| 11. | Gordon, W. C. | History of Canadian O.H.M.S. stamps | 1949 |
| 12. | Gordon, W. C. | Revised list of Canadian O.H.M.S. issues, with all varieties as at Sept. 1, 1950 | 1950 |
| 13. | J.N. Sissons Inc., Toronto | Canada and B.N.A., United States & world wide featuring the collection of the late Dr. L. Seale Holmes and the E. A. Richardson collection of 4 hole perporated O.H.M.S., Tuesday, November 13, 1984. | 1984 |
| 14. | Jackson, William T. | Five hold perf. O.H.M.S. | 1953 |
| 15. | Jackson, William T. | Perforated initials...Canada 5-hole O.H.M.S. | 1954 |
| 16. | Jackson, Wm. T. | Perf. - initials - Canada - 5 hole O.H.M.S. | 1954 |
| 17. | Jackson, Wm. | Canada plate blocks - perf. O.H.M.S. officials | 1959 |
| 18. | Johnson, Jon | What is an 'official' perfin? | 1980 |
| 19. | Tomasson, Gary | Five hole fakes rumor finally put to rest | 1981 |
| 20. | Tomasson, Gary | A perforated insignia coding system | 1981 |