PAN

PAN

Letter from Stefan Żółkiewski written in 23.12.1965

Letter to the Polish Academy of Science written 24.04.1969

Letter to Stefan Żółkiewski written in 07.05.1964

Letter from Jerzy Rudzki written 13.01.1965

Letter from Stefan Żółkiewski written in 12.03.1966

Letter from Stefan Żółkiewski written in 07.07.1967

Letter from Stefan Morawski written N/D

Letter to Władysław Tatarkiewicz written 02.03.1963

Letter to Władysław Tatarkiewicz written 24.11.1962

Letter to the Polish Academy of Science written 05.03.1969

Invitation to scientific discussion written n/d

Letter to the Polish Academy of Science written 24.10.1963