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Letter to Stefan Żółkiewski written in 07.05.1964

Letter from Władysław Witwicki written 16.11.1926

Letter from Władysław Witwicki written 11.08.1923

Letter to the Polish Academy of Science written 24.09.1969

Letter from Władysław Witwicki written 23.12.1924

Letter from Anna Teresa Tymieniecka written 07.02.1957

Letter from Kazimierz Twardowski written 18.03.1925

Letter to the Polish Academy of Science written 22.12.1965

Letter to the Committee of the Library of Classics of Philosophy written 03.12.1964

Letter from Władysław Witwicki written 30.01.1920

Letter from Anna Teresa Tymieniecka written n/d 1

Letter to Kazimierz Twardowski written 07.01.1925