TWARDOWSKI, Łukasz. The role of the Vistula River as a border on the background of historical divisions of Poland and its importance in the current administrative division. Studies in Political and Historical Geography, [S. l.], v. 4, p. 221–252, 2015. DOI: 10.18778/2300-0562.04.09. Disponível em: https://czasopisma.uni.lodz.pl/studiageogr/article/view/18520. Acesso em: 20 may. 2024.