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Plans for research 1

Postcard from Kazimierz Ajdukiewicz written 26.11.1922

Letter to Władysław Tatarkiewicz written 27.06.1968

Letter to Kazimierz Twardowski written 03.08.1924

Letter from Władysław Witwicki written 07.07.1922

Letter from Konstanty Michalski written 07.04.1939

Letter to Stefan Żółkiewski written in 31.05.1967

Letter from Stefan Żółkiewski written in 10.10.1966

Letter to the Polish Academy of Science written 15.09.1964

Letter from Władysław Witwicki written 21.02.1924

Postcard from Tadeusz Kotarbiński written 24.04.1934

Letter from Irena Krońska written in 13.01.1961