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Letter from Irena Krońska written in 19.05.1954

Letter from Irena Krońska written in 16.01.1968

Letter from Irena Krońska written in 10.01.1955

Letter from Irena Krońska written in 05.01.1966 (1)

Letter from Irena Krońska written in 10.10.1954

Letter to Władysław Tatarkiewicz written 07.11.1960

Letter to the Committee of the Library of Classics of Philosophy written 14.05.1954

Letter to National Scientific Publishers written 29.04.1963

Letter from Stefan Morawski written 30.09.N/D

Letter from Irena Krońska written in nd.07.1961

Letter to the National Scientific Publishers written 24.02.1969

Letter from Irena Krońska written in 10.04.1967