| Date
| Topic
| Scott's #
|
| October 24, 1961 | International Telecommunications Union and World Meteorological Organization: satellite | C324 -C325 (2),
C329 (1) |
| September 12, 1962 | International Telecommunications Union: satellite | C338 (1) |
| December 23, 1965 | Olympics: ATS satellite | C417 (1) |
| October 22, 1970 | Apollo 8 | C509 (1) |
| March 10, 1980 | Sympo on Remote Sensing of Environ | C780 - C781 (2) |
| May 18, 1981 | TeleCommunications Day: International Telecommunications Union | C833 - C834 (2) |
| May 5, 1982 | Satellite station | C869 (1) |
| July 17, 1992 | Solar eclipse | 444 (1) |
| November 25, 1995 | Telecommunications InstInternational Telecommunications Unionte, 30th anniversary | C926 (1) |