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Letter from Tadeusz Czeżowski written 08.12.1965

Letter to Władysław Tatarkiewicz written 27.06.1969

Letter to Władysław Tatarkiewicz written 28.04.1970

Letter to National Scientific Publishers written 29.04.1963

Letter from Irena Krońska written in 22.11.1966

Letter from Irena Krońska written in 15.10.1965

Letter from Władysław Tatarkiewicz written 21.01.1961

Letter to Irena Krońska written in 22.08.1963

Letter to Irena Krońska written in 18.03.1966

Contract with the National Scientific Publishers written 10.12.1954

Letter from Lucyna Majzner written 01.04.1965

Letter from Irena Krońska written in 01.07.1965