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Artefacts made of and from untypical materials with the use of sophisticated techniques preserved in museums constitute an exceptional challenge to museum curators. Such is the case of two letters described in the paper, written on birch bark by someone signed as the female: Janka and Jaśka dispatched to her mother from the Soviet Polovinka Gulag in the Urals in 1946 and 1947. Currently, the artefacts...
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