Letter from Władysław Witwicki written 21.01.1927

Letter to Daniela Gromska written 10.09.1963

Letter from Henryk Elzenberg written 07.06.1951

Postcard from Tadeusz Czeżowski written 24.03.1958

Letter from Władysław Tatarkiewicz written 06.12.1938

Letter from Stefan Morawski written N/D

Letter to the Committee of the Library of Classics of Philosophy written 29.01.1953

Letter from Tadeusz Czeżowski written 23.03.1958

Letter from Henryk Elzenberg written 02.07.1963