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Letter from Kazimierz Ajdukiewicz written 24.10.1923

Letter from Konstanty Michalski written 20.02.1939

Letter from Anna Teresa Tymieniecka written 29.10.1956

Postcard from Malvine Husserl written 19.11.1930

Letter from Konstanty Michalski written 09.02.1939

Letter from Tadeusz Czeżowski written 09.03.1958

Letter from Tadeusz Czeżowski written 29.01.1961

Letter from Tadeusz Czeżowski written 08.12.1965

Letter from Władysław Tatarkiewicz written 28.05.1966

Letter from Kazimierz Twardowski written 16.03.1924

Letter from Konstanty Michalski written 07.04.1939

Letter to Tadeusz Czeżowski written 18.02.1958