Brzoza czarna (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Brzoza czarna" in Polish language version.

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botany.pl

maxbot.botany.pl

Izabella Franiel. Problemy taksonomiczne Betula obscura (Betulaceae) – przegląd literatury. „Fragm. Flor. Geobot. Polonica”. 16, 1, s. 27–32, 2009.