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Letter from Stefan Morawski written 03.06.1964

Letter from Tadeusz Kotarbiński written 04.11.1926

Letter to Kazimierz Twardowski written 28.03.1922

Attachement to the letter to Henryk Markiewicz written 16.03.1964

Letter from Władysław Witwicki written 29.03.1926

Letter from Stanisław Ignacy Witkiewicz written 29.04.1935

Letter from Stanisław Ignacy Witkiewicz written 23.10.1936