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Maps of the range and distribution of the thick-shelled river mussel Unio crassus: A − Europaean part of U. crassus range (light grey polygon) according to Welter-Schultes (2012) and Lopes-Lima et al. (2017a); B − U. crassus occurrence in Poland according to Zając (2018, modified): grey dot − squares 10 × 10 km with U. crassus sites.
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