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Letter to Kazimierz Twardowski written 29.11.1927

Letter to Stefan Żółkiewski written in 07.05.1964

Postcard from Wacław Borowy written 16.02.1922

Letter from Tadeusz Czeżowski written 5/2/1947

Postcard from Wacław Borowy written 3.08.1922

Letter from Tadeusz Czeżowski written 02.05.1947

Letter from Tadeusz Czeżowski written 25.10.1947

Letter from Stefan Błachowski written 13.07.1945

Protocol from the meeting of the PPS Board 12.05.1957

Letter to Kazimierz Twardowski written 28.02.1924

Letter from Jan Maria Bocheński written 24.04.1957

Letter to Stefan Błachowski written 10.02.1949