Kiper D. Cognitive value of a letter to the editor as a source of knowledge on the basis of letters sent to the editors of periodicals for the polish minority in the United States at the turn of the twentieth century. AE [Internet]. 2022 Oct. 19 [cited 2024 Aug. 17];:43-59. Available from: https://apcz.umk.pl/AE/article/view/40292