File:USSR PCWCS №05 Society Znanie.jpg
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![File:USSR PCWCS №05 Society Znanie.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/USSR_PCWCS_%E2%84%9605_Society_Znanie.jpg/800px-USSR_PCWCS_%E2%84%9605_Society_Znanie.jpg?20150814194053)
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Categories:
- Postal cards of the Soviet Union, 1972
- Science on postal cards
- Organizations on postal cards of the Soviet Union
- Znanie (All-Union Society)
- Anniversaries on postal cards of the Soviet Union
- Atoms on stamps
- Oscillograms on stamps
- Torches on stamps
- Books on stamps of the Soviet Union
- Surfaces on stamps
- Cereals on stamps
- Ears on stamps (botany)
- Monument to the Conquerors of Space on stamps
- Orbits in art