According to the Clotilda of Prokhaska, to admit to the service in her brewery, the son of her Austrian citizen Franz Prokhask.

According to the Clotilda of Prokhaska, to admit to the service in her brewery, the son of her Austrian citizen Franz Prokhask./ Council of Ministers.- 1917. - (Council of Ministers .. Inventory inventory No. 21. 1917.).-Film..I. Council of Ministers ..Electronic copy source: RGIAOriginal storage location: RGIA f.1276 op.21 d.246