PWN

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Letter from Tadeusz Zabłudowski written nd.01.1963

Letter from Irena Krońska written in 13.01.1961

Letter to Irena Krońska written in 19.01.1955

Letter to the Committee of the Library of Classics of Philosophy written 14.05.1954

Letter to the National Scientific Publishers written 08.01.1964

Letter to Roman Ingarden written 22.01.1964

Letter from Irena Krońska written in 29.10.1965

Letter from Irena Krońska written in 25.04.1966

Letter to Władysław Tatarkiewicz written 19.07.1969

Letter to the National Scientific Publishers written n/d

Postcard from Tadeusz Czeżowski written 13.02.1966

Letter from Stefan Morawski written 30.09.N/D