Letter from Władysław Witwicki written 23.12.1923

Letter from Stanisław Ignacy Witkiewicz written 20.10.1936

Letter to Władysław Tatarkiewicz written 29.11.1949

Postcard from Stanisław Ignacy Witkiewicz written 09.07.1939

Letter from Stefan Żółkiewski written in 20.01.1966

Letter from Kazimierz Wyka written 19.02.1967

Letter from Tadeusz Czeżowski written 17.12.1948

Letter from Bogdan Suchodolski written in n.d. (2)

Letter to the Committee of the Library of Classics of Philosophy written 27.04.1954

Letter from Kazimierz Twardowski written 19.05.1924

Article of Wacław Borowy in “The Warsaw Review”? from 2.05.1925

Letter from Malvine Husserl written 12.12.1920