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Postcard from Wacław Borowy written 10.08.1922

Letter from Tadeusz Czeżowski written 02.05.1947

Letter to Stefan Żółkiewski written in 07.05.1964

Letter to Tadeusz Kotarbiński written 23.02.1961

Letter to Tadeusz Kotarbiński written 29.05.1953

Letter from Jan Maria Bocheński written 24.04.1957

Protocol from the meeting of the PPS Board 12.05.1957

Letter from Tadeusz Czeżowski written 5/2/1947

Letter to Stefan Błachowski written 10.02.1949

Letter to Kazimierz Twardowski written 22.02.1925

Letter from Tadeusz Kotarbiński written 04.03.1961

Letter from Tadeusz Czeżowski written 25.10.1947