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Letter from Maria Gołaszewska written 22.05.1966

Letter from Irena Krońska written in 19.05.1954

Letter to the Committee of the Library of Classics of Philosophy written 14.05.1954

Letter to the Committee of the Library of Classics of Philosophy written 03.03.1954

Letter to Stefan Żółkiewski written in 23.12.1965 (b)

List of publications written 04.01.1937

Letter from Stefan Żółkiewski written in 26.11.1965

Letter from Kazimierz Ajdukiewicz written 2/26/1961

Postcard to Kazimierz Twardowski written 10.08.1937

Letter to the Committee of the Library of Classics of Philosophy written 11.03.1952

Letter from Konstanty Michalski written N/D

Letter from Kazimierz Ajdukiewicz written 26.02.1961