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17. 02. 2026
Minerals on stamps (V.) - Tourmaline
The fifth part of the interesting overview of postage stamps devoted not only to minerals and mineralogy but also to other related areas (gemmology, crystallography, meteoritics) as well as personalities, museums with expositions of minerals, precious stones in crown jewels, etc.
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04. 02. 2026
24. 01. 2026
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