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Letter to the Committee of the Library of Classics of Philosophy written 17.08.1952

Letter from Irena Krońska written in 10.01.1955

Letter from Irena Krońska written in 23.03.1953

Letter to the Committee of the Library of Classics of Philosophy written 17.12.1954

Letter to Irena Krońska written in 18.10.1965

Letter to the Committee of the Library of Classics of Philosophy written 14.03.1963

Letter to the Committee of the Library of Classics of Philosophy written 24.03.1954

Letter to the Committee of the Library of Classics of Philosophy written 29.05.1954

Letter from Irena Krońska written in 06.08.1966

Letter from Irena Krońska written in 09.03.1953

Letter from Irena Krońska written in 29.10.1965

Letter from Irena Krońska written in 13.12.1954