Stamps of Russia, 9 Jun 1971
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postage
1971, Jun 9 13th International Science History Congress issue - congresses unwmk p. 12
| - | 6k | multi | science |
1971, Jun 9 5th General Assembly of Geodesics and Geophysics issue - congresses
| - | 6k | multi | satellite |
1971, Jun 9 8th International Oil Congress issue - congresses
| - | 6k | multi | oil industry |
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