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Letter from Władysław Tatarkiewicz written 04.04.1922

Letter from Władysław Witwicki written 17.05.1922

Letter from Władysław Witwicki written 03.05.1922

Lecture of Roman Ingarden on 14th International Congress of Philosophy 02.09.1968 – 09.09.1968

Letter from Stefan Szuman written 02.06.1942

Letter from Halina Poświatowska written 25.07.1964

Letter from Stefan Szuman written 09.04.1942