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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 12.08.1952

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

Letter from Irena Krońska written in 13.12.1954

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

Letter from Irena Krońska written in 23.03.1953