Clinical surgery : extracts from the reports of surgical practice between the years 1860-1876 / by T. Billroth ; translated… https://www.rawpixel.com/image/13979278/image-paper-cartoon-plantFree Image from public domain licensePortret van Alexander Numan (1836) by J B Clermans, Johan Martin Billroth and Desguerrois and Co https://www.rawpixel.com/image/13770876/image-paper-face-personFree Image from public domain licenseChristian Albert Theodor Billroth. Heliogravure by J. Löwy. https://www.rawpixel.com/image/13997277/christian-albert-theodor-billroth-heliogravure-lowyFree Image from public domain licenseDrie joodse kooplieden (1829 - 1851) by Johan Martin Billroth and Johan Martin Billroth https://www.rawpixel.com/image/13772621/image-paper-face-peopleFree Image from public domain licenseChristian Albert Theodor Billroth. Photograph by F. Luckhardt. https://www.rawpixel.com/image/13991331/christian-albert-theodor-billroth-photograph-luckhardtFree Image from public domain licenseChristian Albert Theodor Billroth. Photograph by F. Luckhardt. https://www.rawpixel.com/image/14003802/christian-albert-theodor-billroth-photograph-luckhardtFree Image from public domain licenseChristian Albert Theodor Billroth. Photograph by Fritz Luckhardt. https://www.rawpixel.com/image/13979023/christian-albert-theodor-billroth-photograph-fritz-luckhardtFree Image from public domain license