Polish character of Upper Silesia according to official Prussian sources and the results of the plebiscite - Firich, Karol (Central Polish Plebiscite Committee, 1921)
by Charles T. Firich ; forew. by W. Trąmpczyński ; Engl. text by Waldemar A. Przedpelski.
Keywords: Plebiscyt 1921 r. na Górnym Śląsku; Śląsk, Górny; ludność