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- Postage stamps10
- Science on postage stamps10
- Commemorative postage stamps9
- Nobel Prize winners4
- Germany (East)2
- Physicists2
- Postmarks2
- Soviet Union2
- Behring, Emil von, 1854-19171
- Biologists1
- Cachets (Philately)1
- Chad1
- Congresses and conventions1
- Einstein, Albert, 1879-19551
- First day covers (Philately)1
- Fleming, Alexander, 1881-19551
- France1
- Ghana1
- Hoff, J. H. van 't (Jacobus Henricus), 1852-19111
- International Conference on the Peaceful Uses of Atomic Energy1