NSVL
Praegu kuvatakse: NSVL - postmargid (1923 - 1991) - 1 margid.
1959
International Geophysical Co-operation
18. august WM: mitte ükski lehe suurus: 50 Disain: I. Levin perforatsioon: 12 x 12¼
![[International Geophysical Co-operation, Tüüp BTR]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/BTR-s.jpg)
![[International Geophysical Co-operation, Tüüp BTS]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/BTS-s.jpg)
![[International Geophysical Co-operation, Tüüp BTT]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/BTT-s.jpg)
