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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 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 25.03.1953

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

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

Letter to the Committee of the Library of Classics of Philosophy written 03.12.1964

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

Letter from Irena Krońska written in 13.12.1954

Letter from Irena Krońska written in 06.08.1966

Letter from Irena Krońska written in 29.10.1965

Letter to Irena Krońska written in 22.03.1954