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

Letter from Irena Krońska written in 06.08.1966

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

Letter from Irena Krońska written in 13.12.1954

Letter from Irena Krońska written in 09.03.1953

Letter to the Committee of the Library of Classics of Philosophy written 30.09.1954