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Letter to Kazimierz Twardowski written 31.10.1919

Letter to Kazimierz Twardowski written 30.12.1920

Letter to Kazimierz Twardowski written 28.03.1922

Letter to Władysław Tatarkiewicz written 10.02.1949

Letter from Stanisław Ignacy Witkiewicz written 04.11.1937

Postcard from Tadeusz Czeżowski written NDA 02.1949

Letter from Henryk Markiewicz written 24.02.1964

Letter from Władysław Tatarkiewicz written 17.05.1948

Letter from Wacław Borowy written 29.05.1939

Letter to the National Scientific Publishers written 24.02.1969

Letter to Henryk Markiewicz written 16.03.1964

Letter from Jarosław Iwaszkiewicz written 26.02.1947