PWN

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Letter to National Scientific Publishers written 29.04.1963

Letter to Władysław Tatarkiewicz written 08.02.1962

Letter to the Committee of the Library of Classics of Philosophy written 12.08.1952

Letter from Irena Krońska written in 12.02.1955

Letter from Tadeusz Czeżowski written 10.10.1957

Letter from Irena Krońska written in 16.01.1968

Postcard from Stefan Morawski written 16.04.1966

Letter from Irena Krońska written in 08.06.1955

Letter from Irena Krońska written in 14.12.1964

Letter from Władysław Tatarkiewicz written 30.06.1969

Letter from Hanna Rosnerowa written 04.10.1962

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