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Letter to Stefan Żółkiewski written in 07.05.1964

Letter from Tadeusz Kotarbiński written 04.03.1961

Letter from Tadeusz Czeżowski written 25.10.1947

Letter from Stefan Błachowski written 13.07.1945

Letter from Tadeusz Czeżowski written 25.10.1947

Postcard from Wacław Borowy written 3.08.1922

Postcard from Wacław Borowy written 24.08.1922

Letter to Kazimierz Twardowski written 28.02.1924

Letter to Kazimierz Twardowski written 22.02.1925

Letter to Władysław Tatarkiewicz written N/D (b)

Letter to Tadeusz Kotarbiński written 23.02.1961

Protocol from the meeting of the PPS Board 12.05.1957