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Otto Julius Bierbaum. de Otto Julius Bierbaum Portrait von de Flix Vallotton zeno org OttoJulius Creator Flix Vallotton This image is in the public domain due to its age PDold original upload log page de OJBierbaumFV Jbergner bytes no Information Otto Julius Bierbaum Portrait von Flix Vallotton zeno org OttoJulius Flix