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Letter to Kazimierz Twardowski written 05.09.1924

Letter to Kazimierz Twardowski written 26.10.1919

Letter to Kazimierz Twardowski written 26.11.1934

Letter from Tadeusz Czeżowski written 29.01.1961

Letter from Kazimierz Twardowski written 06.12.1924

Letter to the Polish Academy of Science written 22.12.1965

Letter from Kazimierz Twardowski written 26.11.1934

Postcard from Tadeusz Czeżowski written 24.02.1967