The left image, a photo by Joseph Lowy, is at the Österreichische Nationalbibliothek in Wien and was found in Wikimedia; the contrast was decreased and the size fixed at 39.02 cm high at 28.35 pixels/cm. The right image was found at liveinternet.ru/users/taniaum/post355132468/; its contast was increased and the size was set at 39.02 cm high at 28.35 pixels/cm.