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Letter from Kazimierz Twardowski written 06.02.1923

Letter to the Polish Academy of Science written 28.04.1964

Letter from Stefan Żółkiewski written in 03.01.1968

Letter to Stefan Żółkiewski written in 06.03.1966

Letter from Roman Suszko written 15.02.1965

Letter from Konstanty Michalski written N/D

Letter from Irena Krońska written in 19.05.1954

Letter from Kazimierz Ajdukiewicz written 2/26/1961

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

Letter from Ksawery Piwocki written 11.11.1964

Letter from Stefan Żółkiewski written in 26.11.1965

Letter to Anna Teresa Tymieniecka written 21.03.1969