The 10th International Congress of Mathematics in Innsbruck 1981
Now showing: Austria - Postage stamps - 1981 - The 10th International Congress of Mathematics in Innsbruck - 1 stamps.
1981
The 10th International Congress of Mathematics in Innsbruck
14. September WM: None Sheetsize: 50 Design: V. Wurnitsch Perforation: 14¼ x 13¾
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