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Letter from Tadeusz Kotarbiński written 06.06.1923

Letter from Władysław Witwicki written 11.08.1923

Letter to Kazimierz Twardowski written 21.02.1926

Letter to Kazimierz Twardowski written 23.12.1931

Letter to Kazimierz Twardowski written 08.03.1930

Letter from Irena Sławińska written 2/23/1958

Letter from Kazimierz Twardowski written 26.11.1934

Letter to Kazimierz Twardowski written 03.06.1932

Postcard to Kazimierz Twardowski written 06.08.1934

Letter to the Committee of the Library of Classics of Philosophy written 21.08.1952 A

Letter to Tadeusz Czeżowski written 18.02.1958

Letter from Tadeusz Czeżowski written 16.10.1958