Bulgaria
Ora in esposizione: Bulgaria - Francobolli postali (1879 - 2024) - 1 francobolli.
1971
The 7th Congress of the Federation of the Societies of Biochemistry and Molecular Biology (FEBS)
20. Settembre WM: Nessuno Dentellatura: 12½
![[The 7th Congress of the Federation of the Societies of Biochemistry and Molecular Biology (FEBS), Scrivi BUO]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/BUO-s.jpg)