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Letter from Władysław Tatarkiewicz written 27.02.1966

Letter to Kazimierz Twardowski written 07.10.1927

Letter from Irena Krońska written in 05.01.1966

Letter from Mieczysław Wallis written 10.08.1963

Terms for translating Spinoza’s Ethics written n/d

Letter from Henryk Markiewicz written 15.07.1963

Letter to Władysław Tatarkiewicz written 07.11.1969

Postcard from Juliusz Kleiner written 02.09.1945

Letter from Władysław Witwicki written 20.09.1922

Letter from Stefan Morawski written 27.10.1965

Letter to the Polish Academy of Science written 28.04.1964

Letter to Kazimierz Twardowski written 08.03.1930