JAROS, Jerzy. Polish Coal Mining in Interwar Poland and in People’s Poland. Studia Historiae Oeconomicae, [S. l.], v. 4, n. 1, p. 157–170, 1970. DOI: 10.14746/sho.1970.04.1.009. Disponível em: https://pressto.amu.edu.pl/index.php/sho/article/view/57111. Acesso em: 14 oct. 2026.