Now showing: Bulgaria - Postage stamps (1879 - 2024) - 1 stamps.
14. September WM: None Perforation: 12½
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![[The 7th World Sociology Congress, Varna, type BRF]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/BRF-s.jpg)
