File:The Soviet Union 1968 CPA 3691 stamp (Diploma, Silver Medal and Prize-winning Stamp CPA 3023 (3rd Thematic Biennale Competition, Buenos Aires, Argentina, 1965)).jpg
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Categories:
- 1968 all stamps of the Soviet Union
- Awards to Soviet Post Office Soviet Union stamp series, 1968
- 1964 all stamps of the Soviet Union
- Silver medals on stamps
- Stamps of the Soviet Union on stamps
- Monuments and memorials in the Soviet Union on stamps
- Stratonauts memorial
- Maps of South America on stamps
- Argentina on stamps
- Thematic Biennale
- Philately in Argentina