Polar Day Events, 75th Anniversary Northwest Passage
Additional Details:
| Commemorates the 75th Anniversary of the completion of the Northwest Passage (1903-1906), the 55th Anniversary of the Norge Airship's North Pole Flight (May 11-12, 1926), and the 70th Anniversary of the South Pole Discovery (Dec 14, 1911). Also celebrates the 25th Anniversary of the American Society of Polar Philatelists 8th Annual Convention in Spokane, WA, June 3-6, 1981. |
