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

Letter to Kazimierz Twardowski written 27.01.1923

Letter from Kazimierz Ajdukiewicz written 26.02.1961

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

Letter to the Committee of the Library of Classics of Philosophy written 03.06.1955

Letter from Konstanty Michalski written N/D

Letter to the Committee of the Library of Classics of Philosophy written 27.04.1954

Letter to Kazimierz Twardowski written 09.09.1934

Postcard to Kazimierz Twardowski written 21.04.1923

Letter from Stefan Żółkiewski written in 03.01.1968

Letter to Anna Teresa Tymieniecka written 21.03.1969

Letter to the Polish Academy of Science written 28.04.1964