Letter from Irena Sławińska written 11/17/1968

Postcard from Kazimierz Ajdukiewicz written 10.10.1948, pp.1,2

Letter from Karol Wojtyła written 03.04.1968

Letter to Tadeusz Kotarbiński written 23.02.1961

Postcard from Tadeusz Czeżowski written 23.03.1967

Letter from Stefan Szuman written 01.06.1939

Letter from Tadeusz Czeżowski written 05.04.1965

Letter from Kazimierz Ajdukiewicz written 20.11.1949

Lecture of Roman Ingarden in Oxford nd.nd.1962

Letter to the Polish Academy of Science written 15.09.1964

Letter from Tadeusz Kotarbiński written 24.10.1936

Letter from Tadeusz Czeżowski written 10.10.1957