Vignet voor de Volksuniversiteit Hilversum (1920) by Richard Nicolaüs Roland Holst and Richard Nicolaüs Roland Holst https://www.rawpixel.com/image/13739124/image-paper-book-artFree Image from public domain licenseJournal of science and the arts / Royal Institution of Great Britain. https://www.rawpixel.com/image/14010575/journal-science-and-the-arts-royal-institution-great-britainFree Image from public domain license