Title: The anatomy and physiology of the horse : with anatomical and questional illustrations : containing, also, a series… https://www.rawpixel.com/image/9976432/image-face-person-artFree Image from public domain licenseDie Gewinnung des Diphtherieserums aus Pferdeblut im Behringwerk zu Marburg. Four men in white smocks extract blood from two… https://www.rawpixel.com/image/8786618/image-art-vintage-booksFree Image from public domain licenseAPHIS personal checks the identification on a horse during inspectionUSDA photo by R. Anson Eaglin https://www.rawpixel.com/image/9654191/image-face-hand-personFree Image from public domain license