Kunz, Mieczysław, and Andrzej Nienartowicz. “Spatial Distribution of Heathlands in the North-Western Part of Poland (Pomerania District)”. Ecological Questions 12 (July 14, 2010): 157–164. Accessed July 18, 2024. https://apcz.umk.pl/EQ/article/view/v10090-010-0009-9.