Sixteen French doctors with attributes of their specialties. Colour lithograph by A. Barrère, ca. 1906. https://www.rawpixel.com/image/13960983/image-cartoon-person-artFree Image from public domain license"Berlin to New York in less than One Hour!" written by Hugo Gernsback and illustrated by Frank R. Paul in the November 1931… https://www.rawpixel.com/image/7665177/image-paper-art-vintageFree Image from public domain licenseVirgin and child with child standing on her lap; she wears blue cloak with hood and hold red carnation; four haloed… https://www.rawpixel.com/image/7655040/image-background-book-vintageFree Image from public domain licenseVogel in begroeiing aan het water (1911 - 1914) by Theo van Hoytema https://www.rawpixel.com/image/13737580/vogel-begroeiing-aan-het-water-1911-1914-theo-van-hoytemaFree Image from public domain licenseStaal met bedrukte zijde, dessin Aussee (1911 - 1914) by Wiener Werkstätte and Leopold Blonder https://www.rawpixel.com/image/13735383/photo-image-paper-art-patternFree Image from public domain licenseFifteen French doctors wearing aprons and holding various instruments. Colour lithograph by A. Barrère, ca. 1903. https://www.rawpixel.com/image/13959298/image-cartoon-people-bookFree Image from public domain licenseFourth International Congress of Zoology , Cambridge University; nine scientists, in academic dress. Photograph by F.J.… https://www.rawpixel.com/image/14020149/photo-image-person-clothing-manFree Image from public domain license