1965
International Quiet Sun Year and Space Research
WM: 9
![[International Quiet Sun Year and Space Research, type WM]](http://2philately.com/wp-content/uploads/2026/05/imwprobot-ddb255dc1ab9dd695ad62fbea95de619.jpg)
![[International Quiet Sun Year and Space Research, type WN]](http://2philately.com/wp-content/uploads/2026/05/imwprobot-d694212cf9a0c6a072c55eae861dc0b5.jpg)
![[International Quiet Sun Year and Space Research, type WO]](http://2philately.com/wp-content/uploads/2026/05/imwprobot-3e2c5b4a499169b36d4cce6eb931ba63.jpg)
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