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Decision written 20.08.1921

Letter from Władysław Tatarkiewicz written 24.07.1962

Postcard from Tadeusz Czeżowski written 22.02.1958

Letter to the Polish Academy of Science written 31.03.1965

Postcard from Tadeusz Kotarbiński written 08.02.1927

Letter from Władysław Witwicki written 22.12.1921

Letter to the Polish Academy of Science written 05.03.1969

Letter from Stefan Żółkiewski written in 20.01.1966

Letter from Irena Krońska written in 23.03.1953

Letter from Władysław Tatarkiewicz written 03.05.1965

Letter from Kazimierz Ajdukiewicz written 11/20/1949

Letter to Kazimierz Twardowski written 16.08.1923