The 5th World Energy Conference - Vienna 1956 1956
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1956
The 5th World Energy Conference - Vienna 1956
8. maj VM: Ingen Design: Elisabeth Fritz Gravering: Georg Wimmer Perforeringer: 13¾ x 14½
![[The 5th World Energy Conference - Vienna 1956, type UM]](https://www.stampworld.com/media/catalogue/Austria/Postage-stamps/UM-s.jpg)
