Stamps of Austria, 10th International Mathematical Congress issue

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postage

1981, Sep 14 10th International Mathematical Congress issue unwmk p. 14.25x13.75
Colnect-137-117--quot-Impossible-Dice-Construction-quot--by-MC-Escher-1898-1972.jpg
- 4s multi Impossible Dice Construction by MC Escher 1898-1972

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