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Letter to Kazimierz Twardowski written 10.12.1924

Plans for research 1

Letter from Stanisław Ignacy Witkiewicz written 12.01.1938

Letter to Kazimierz Ajdukiewicz written 9/22/1949

Letter from Irena Krońska written in 07.09.1954

Letter from Tadeusz Czeżowski written 09.04.1968

Letter from Władysław Witwicki written 14.01.1927

Letter from Józef Tischner written 28.04.1966

Letter to Władysław Tatarkiewicz written 10.06.1952

Letter from Tadeusz Czeżowski written 11.06.1966

Letter to the Polish Academy of Science written 10.09.1963

Letter from Irena Krońska written in 09.09.1954