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Letter to Kazimierz Twardowski written 12.09.1927

Letter from Henryk Markiewicz written 24.02.1964

Letter to Kazimierz Twardowski written 02.06.1920

Postcard from Tadeusz Czeżowski written 13.11.1948

Letter from Stanisław Ignacy Witkiewicz written 09.02.1939

Letter to Kazimierz Twardowski written 18.02.1923

Letter to Kazimierz Twardowski written 16.08.1923

Letter from Stanisław Ignacy Witkiewicz written 27.01.1939

Letter to Kazimierz Twardowski written 06.04.1920

Letter to Władysław Tatarkiewicz written 22.03.1969

Letter to the National Scientific Publishers written 24.02.1969

Postcard from Wacław Borowy written 12.04.1937