13th International Science History Congress, 1971, Moscow 6 Soviet kopek — USSR, 1971
13th International Science History Congress, 1971, Moscow (USSR, 1971), face value 6 Soviet kopek, “International Congresses, 1971” series. Photo, catalogue…
- Series
- International Congresses, 1971
- Issue date
- 1971
- Face value
- 6 Soviet kopek
- Colors
- Green | Medium grey
- Print run
- 4,000,000