Perfect Pictures at a Glance. Original public domain image from the MET museum. https://www.rawpixel.com/image/7639884/original-public-domain-image-from-the-met-museumFree Image from public domain licenseNine famous Swedish doctors, numbered with a key from 28-36. Lithograph by A. Hardh. https://www.rawpixel.com/image/13981711/image-cartoon-face-peopleFree Image from public domain license