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Letter to Tadeusz Czeżowski written 17.08.1969

Letter to Władysław Tatarkiewicz written 22.03.1969

Postcard from Kazimierz Ajdukiewicz written 18.12.1922

Letter to Kazimierz Twardowski written 17.08.1924

Letter to Kazimierz Twardowski written 22.11.1922

Letter to Kazimierz Twardowski written 07.10.1927

Letter from Władysław Tatarkiewicz written 11.01.1961

Letter to Kazimierz Twardowski written 19.08.1919

Letter from Tadeusz Czeżowski written 11.11.1949

Letter from Wacław Borowy written 9.04.1922

Letter to Władysław Tatarkiewicz written 08.08.1968

Letter from Tadeusz Czeżowski written 29.05.1958