| Stamps by countries | Europa | Bulgaria | |
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Sofia Zoo. Bison. 23.05.1966 Michel 1624 Scott 1491 Yvert 1422 |
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Rare mammals. Wisent. 29.06.1973 Michel 2252 Scott 2102 Yvert 2012 |
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Animals acclimatized in Bulgaria. Wisent. 25.09.2000 Michel 4486 Scott 4161 Yvert 3883 |
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