PAN

PAN

Invitation to scientific discussion written n/d

Letter to the Polish Academy of Science written 10.09.1963

Letter to Tadeusz Kotarbiński written 22.11.1948

Letter to the Polish Academy of Science written 22.09.1964

Letter from Tadeusz Kotarbiński written 04.03.1961

Certificate from Irena Krońska written in 10.06.1955

Letter from Stefan Żółkiewski written in 27.11.1965

Letter from Kazimierz Wyka written 14.07.1967

Letter to the Polish Academy of Science written 18.01.1965

Letter from Stefan Żółkiewski written in 01.03.1966

Letter to Władysław Tatarkiewicz written 05.07.1968

Letter from Stefan Żółkiewski written in 26.02.1964