| REFERENCES |
| The following books / catalogues were used to compile the information contained here: |
| 1. DuBois, Robert J., Catalog of Olympic labels |
| 2. "Post, Philately and Olympism, Vol II", International Olympic Committee |
| 3. Sekimoto, A., Linn's Stamp News, Jan 14, 1980 |
| 4. "N.Y.K. Envelopes for the XII Olympiad Tokyo 1940", Japanese Philately, Aug. 1992 |
| 5. Auction catalogues of Heiko Volk |
| 6. Auction catalogues of Healey and Wise |