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Letter to Kazimierz Twardowski written 29.03.1923

Postcard from Kazimierz Twardowski written 08.04.1923

Letter from Anna Teresa Tymieniecka written 02.06.1969

Postcard to Kazimierz Twardowski written 24.08.1936

Letter from Stefan Żółkiewski written in 10.01.1964

Letter to Tadeusz Kotarbiński written 17.07.1948

Letter from Anna Teresa Tymieniecka written 13.12.1960

Letter from Stefan Żółkiewski written in 03.01.1961

Letter from Tadeusz Czeżowski written 16.10.1958

Letter from Henryk Elzenberg written 07.12.1947

Letter from Irena Krońska written in 21.07.1968

Letter from Stefan Żółkiewski written in 13.12.1966