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Letter from Kazimierz Twardowski written 06.12.1924

Postcard from Tadeusz Czeżowski written 24.02.1967

Letter from Tadeusz Czeżowski written 29.01.1961

Letter to Kazimierz Twardowski written 26.10.1919

Letter from Irena Krońska written in 06.01.1947

Letter from Kazimierz Twardowski written 26.11.1934

Letter to Kazimierz Twardowski written 05.09.1924

Letter from Irena Krońska written in 01.02.1947

Letter from Irena Krońska written in 31.03.1947

Letter to the Polish Academy of Science written 22.12.1965

Letter to Kazimierz Twardowski written 26.11.1934