Stamps of Bulgaria, 20 Sep 1971
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postage
1971, Sep 20 Bulgarian People’s Republic, 25th anniv. issue unwmk p. 13.5x12.75
| - | 2s | Statue of Republic | ||||
| - | 13s | Bulgarian flag |
1971, Sep 20 Congress of Biochemistry, Varna issue p. 12.5
| X | 13s | multi | Double Helix of DNA |
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