World Congress of Sociology, Varna 13 ст — Bulgaria, 1970
World Congress of Sociology, Varna (Bulgaria, 1970), face value 13 ст. Photo, catalogue value, details and photo identification.
- Issue date
- 1970
- Face value
- 13 ст
- Colors
- Multicolor
- Print run
- 120,000
- Yvert
- BG 1811
- Michel
- BG 2033
- Stanley Gibbons
- BG 2031
- Scott
- BG 1908