PWN

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Letter from Irena Krońska written in 15.10.1965

Letter from Tadeusz Czeżowski written 08.12.1965

Letter from Irena Krońska written in 06.09.1962

Letter to the National Scientific Publishers written n/d

Letter from Irena Krońska written in 04.03.1967

Letter from Irena Krońska written in 03.06.1954

Letter from Irena Krońska written in 22.10.1960

Letter from Irena Krońska written in 07.06.1955 (a)

Letter to Władysław Tatarkiewicz written 05.02.1958

Letter from Irena Krońska written in 27.09.1965

Letter from Irena Krońska written in 08.06.1954

Letter to the National Scientific Publishers written 31.01.1963