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Letter to Stefan Błachowski written 10.02.1949

Letter from Jan Maria Bocheński written 24.04.1957

Letter to Kazimierz Twardowski written 29.11.1927

Postcard from Wacław Borowy written 10.08.1922

Letter to Kazimierz Twardowski written 22.02.1925

Letter from Tadeusz Kotarbiński written 04.03.1961

Letter from Henryk Elzenberg written 07.12.1947

Postcard from Wacław Borowy written 16.02.1922

Letter from Tadeusz Kotarbiński written 09.11.1947

Postcard from Wacław Borowy written 24.08.1922

Letter from Stefan Błachowski written 13.07.1945

Postcard from Wacław Borowy written 3.08.1922