File:The Soviet Union 1966 CPA 3307 stamp (7th Crystallography International Congress (12-21.07, Moscow). Emblem - Crystals. Artificially Grown up Crystal of Quartz and Structure of Scheelite Mineral) cancelled.jpg
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Categories:
- 1966 all stamps of the Soviet Union
- Scientific Congresses Soviet Union stamp series, 1966-1968
- Conferences in 1966
- Quartz on stamps
- Scheelite
- Multilingual stamps of the Soviet Union, 1966
- Crystals on stamps
- Crystallography on stamps
- Physics conferences
- Congresses on stamps
- July 1966 in Europe
- 1966 events in Moscow
- Bilingual English-Russian signs in Russia