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- Commemorative postage stamps4
- Postage stamps[remove]4
- Science on postage stamps4
- Nobel Prize winners3
- Cachets (Philately)2
- Canada2
- First day covers (Philately)2
- Alchemists1
- Banting, Frederick Grant, Sir, 1891-19411
- Best, Charles Herbert, 1899-19781
- Biologists1
- Congo (Brazzaville)1
- Fleming, Alexander, 1881-19551
- Medical botanists1
- Medical scientists1
- Monaco1
- Nuclear physics1
- Penicillin1
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