Stamps of Russia, 30 May 1968
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postage
1968, May 30 international congresses unwmk p. 12
| X | 6k | multi | oils | |||
| X | 6k | multi | c.energy |
1968, May 30 8th Congress for Mineral Research issue - international congresses
| X | 6k | multi | crystal |
1968, May 30 13th Entomological Congress issue - international congresses
| X | 6k | multi | Carabus schoenherri Emblem of 13th Entomological Congress |
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