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Letter from Irena Krońska written in 05.01.1966

Letter to the Committee of the Library of Classics of Philosophy written 24.03.1954

Letter to Irena Krońska written in 24.01.1955

Letter from Stanisław Ignacy Witkiewicz written 02.09.1935

Postcard from Stanisław Ignacy Witkiewicz written 29.08.1937

Postcard from Hans Cornelius written 09.07.1938

Habilitation resolution written 12.02.1925

Postcard from Kazimierz Ajdukiewicz written 04.08.1925

Letter to the Committee of the Library of Classics of Philosophy written 23.01.1953

Letter to the Polish Academy of Science written 05.03.1969

Letter from Adam Schaff written 14.05.1963

Letter from Felix Kaufmann written 27.04.1935