PAN

PAN

Letter to Tadeusz Kotarbiński written 23.02.1961

Letter from Polish Academy of Science written 21.04.1966

Letter from Roman Suszko written 15.02.1965

Letter from Stefan Żółkiewski written in n.d.

Letter from Stefan Żółkiewski written in 23.12.1965

Letter to the Polish Academy of Science written 05.03.1969

Letter to Władysław Tatarkiewicz written 21.09.1960

Letter from Stefan Żółkiewski written in 01.03.1966

Letter from Stefan Żółkiewski written in 19.03.1968

Letter to the Polish Academy of Science written 04.10.1964

Letter to Władysław Tatarkiewicz written 27.06.1969

Letter to the Polish Academy of Science written 15.09.1964