Letter from Irena Sławińska written 19/12/1954

Letter from Stefan Morawski written 03.06.1964

Letter from Stefan Żółkiewski written in 03.01.1961

Letter from Władysław Witwicki written 13.07.1922 A

Postcard to Kazimierz Twardowski written 16.12.1927

Postcard from Konstanty Michalski written 02.08.1938

Letter from Irena Krońska written in 17.11.1954

Postcard from Kazimierz Twardowski written 02.10.1918

Letter to Władysław Tatarkiewicz written 07.04.1966

Letter to the Committee of the Library of Classics of Philosophy written 30.09.1952

Letter from Stefan Morawski written N/D

Postcard from Tadeusz Czeżowski written 14.04.1969