PWN

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Letter to Roman Ingarden written 11.05.1963

Letter to Roman Ingarden written 26.03.1963

Letter to the National Scientific Publishers written 30.03.1963

Letter from Irena Krońska written in 27.09.1965

Letter from Irena Krońska written in 13.01.1961

Letter to the Committee of the Library of Classics of Philosophy written 03.06.1955

Letter to Władysław Tatarkiewicz written 21.04.1961

Letter to Władysław Tatarkiewicz written N/D (b)

Contract with the National Scientific Publishers written 10.12.1954

Letter to Irena Krońska written in 12.01.1955

Letter from Irena Krońska written in 13.12.1954

Letter to the National Scientific Publishers written 31.01.1963