Letter from Władysław Tatarkiewicz written 24.07.1962

Opinions about Ingarden written 15.12.1930

Postcard from Edmund Husserl written 31.08.1931

Letter from Edmund Husserl written 04.05.1918

Letter from Tadeusz Czeżowski written 03.03.1947

Review “Why is there something rather than nothing” written n/d

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

Letter to Władysław Tatarkiewicz written 09.04.1960

Postcard from Stanisław Ignacy Witkiewicz written 16.01.1938

Letter from Kazimierz Twardowski written 26.04.1937

Letter from Jan Patočka written 26.10.1965

Letter to Kazimierz Twardowski written 13.10.1920