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Letter to Kazimierz Twardowski written 12.09.1927

Letter from Stanisław Ignacy Witkiewicz written 04.11.1937

Letter to Kazimierz Twardowski written 02.06.1920

Letter to Władysław Tatarkiewicz written 22.03.1969

Article of Wacław Borowy in “The Warsaw Review”? from 2.05.1925

Letter from Wacław Borowy written 12.12.1926

Letter from Anna Teresa Tymieniecka written 09.05.1970

Postcard from Tadeusz Czeżowski written 30.09.1949

Letter from Tadeusz Czeżowski written 08.12.1965

Letter to Tadeusz Czeżowski written 15.09.1949

Postcard from Tadeusz Czeżowski written NDA 02.1949

Letter from Tadeusz Czeżowski written 22.08.1969