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Letter to Tadeusz Czeżowski written 27.09.1949

Letter to Kazimierz Twardowski written 02.06.1920

Letter to Henryk Markiewicz written 16.03.1964

Letter to Henryk Markiewicz written 22.02.1964

Letter to Kazimierz Twardowski written 13.08.1928

Letter to Tadeusz Czeżowski written 17.08.1969

Letter from Jarosław Iwaszkiewicz written 26.02.1947

Letter to Kazimierz Twardowski written 14.01.1925

Article of Wacław Borowy in “The Warsaw Review”? from 12.05.1925

Letter from Stanisław Ignacy Witkiewicz written 14.02.1939

Letter to Kazimierz Twardowski written 02.05.1922

Letter to the National Scientific Publishers written 24.02.1969