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Changes in species diversity and threats to the avifauna of river valleys of the Kuyavian-Pomeranian Voivodeship, comprising part of the international waterway E-70 . GAT [Internet]. 2013 Oct. 1 [cited 2024 Nov. 13];1(1):101-8. Available from: https://czasopisma.ukw.edu.pl/index.php/gat/article/view/20