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Letter from Tadeusz Kotarbiński written 04.03.1961

Letter to Stefan Błachowski written 10.02.1949

Letter to Tadeusz Kotarbiński written 29.05.1953

Letter from Stefan Błachowski written 13.07.1945

Letter to Kazimierz Twardowski written 29.11.1927

Letter from Jan Maria Bocheński written 24.04.1957

Postcard from Wacław Borowy written 10.08.1922

Protocol from the meeting of the PPS Board 12.05.1957

Letter from Tadeusz Czeżowski written 02.05.1947

Letter to Kazimierz Twardowski written 28.02.1924

Letter to Władysław Tatarkiewicz written N/D (b)

Postcard from Wacław Borowy written 24.08.1922