Christopher Columbus on his death bed with a young man kneeling at the bedside; an open chest full of documents beside.… https://www.rawpixel.com/image/13979284/image-cartoon-frame-personFree Image from public domain licenseDas Gehörorgan der Wirbelthiere : morphologisch-histologische Studien / von Gustaf Retzius. https://www.rawpixel.com/image/13983738/image-background-paper-cartoonFree Image from public domain licenseKraam van een boekhandelaar te Napels (1828) by Carl Gustaf Hjalmar Mörner, François Jean Villain and Gihaut frères https://www.rawpixel.com/image/13772069/image-paper-cartoon-faceFree Image from public domain licenseDas Gehörorgan der Wirbelthiere : morphologisch-histologische Studien / von Gustaf Retzius. https://www.rawpixel.com/image/13981082/image-cartoon-art-public-domainFree Image from public domain licenseJöns Jacob Berzelius. Etching by "A. S." after C. G. Quarnström. https://www.rawpixel.com/image/13976989/jons-jacob-berzelius-etching-a-s-after-quarnstromFree Image from public domain licenseCarolus Linnaeus. Line engraving after G. Lundberg, 1751. https://www.rawpixel.com/image/13987829/carolus-linnaeus-line-engraving-after-lundberg-1751Free Image from public domain licenseDas Gehörorgan der Wirbelthiere : morphologisch-histologische Studien / von Gustaf Retzius. https://www.rawpixel.com/image/13976202/image-paper-cartoon-artFree Image from public domain licensePaleis van Carl Gustaf Wrangel aan stadszijde (1667) by Jean Marot I and Erik Jönssen Dahlberg https://www.rawpixel.com/image/13746904/image-paper-cartoon-personFree Image from public domain licenseDas Gehörorgan der Wirbelthiere : morphologisch-histologische Studien / von Gustaf Retzius. https://www.rawpixel.com/image/13989035/image-paper-cartoon-artFree Image from public domain licenseFive children in a studio setting by Johan Gustaf Wetterholm https://www.rawpixel.com/image/14307655/five-children-studio-setting-johan-gustaf-wetterholmFree Image from public domain licenseCarolus Linnaeus. Line engraving after G. Lundberg, 1751. https://www.rawpixel.com/image/13993240/carolus-linnaeus-line-engraving-after-lundberg-1751Free Image from public domain licenseLouis Pasteur, proponent of the 'germ' theory of disease. Oil painting after A. Edelfelt. https://www.rawpixel.com/image/13987175/image-technology-public-domain-carFree Image from public domain licenseU.S. Army paratroopers assigned to the 2nd Brigade Combat Team, 82nd Airborne Division, rehearse firing a Carl Gustaf… https://www.rawpixel.com/image/8741624/photo-image-fire-public-domain-peopleFree Image from public domain licenseDas Gehörorgan der Wirbelthiere : morphologisch-histologische Studien / von Gustaf Retzius. https://www.rawpixel.com/image/13971637/image-background-paper-cartoonFree Image from public domain license