The danger of Bolshevism (1919) skeleton poster by Rudi Feld. Original public domain image from the Library of Congress.… https://www.rawpixel.com/image/8683821/image-art-vintage-public-domainFree Image from public domain licenseOld German educational poster "Garten und Feld (Tafel 9): Hamster (Cricetus frumentarius Pall.) Hase (Lepus timidius L.)… https://www.rawpixel.com/image/9975973/image-art-vintage-animalFree Image from public domain licenseStudy, Head of a Boy by Therèse Éléonore (Hemery) Lingée, after Jean-Baptiste Greuze https://www.rawpixel.com/image/9328291/study-head-boyFree Image from public domain licenseGeorgica curiosa aucta, das ist ... Bericht und ... Unterricht von dem ... adelichen Land- und Feld-Leben, auf alle in… https://www.rawpixel.com/image/13986981/image-face-person-artFree Image from public domain licenseGeorgica curiosa aucta, das ist ... Bericht und ... Unterricht von dem ... adelichen Land- und Feld-Leben, auf alle in… https://www.rawpixel.com/image/13985036/image-cartoon-face-personFree Image from public domain license