Brasilien
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1967
The 6th Anniversary of the Brazilian Mathematical Congress - Rio de Janeiro
21. Juli Wz: 16 Zähnung: 11½ x 11
![[The 6th Anniversary of the Brazilian Mathematical Congress - Rio de Janeiro, Typ APQ]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Brazil/Postage-stamps/APQ-s.jpg)