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Letter from Władysław Witwicki written 03.05.1922

Letter from Stefan Szuman written 02.06.1942

Letter from Władysław Witwicki written 17.05.1922

Letter from Stefan Szuman written 09.04.1942

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

Letter from Halina Poświatowska written 25.07.1964

Letter from Władysław Tatarkiewicz written 04.04.1922