Acacia karroo Hayne or Vachellia karroo (Karoo thorn, with an unidentified birt wagtail) (1777–1786) painting in high… https://www.rawpixel.com/image/3079714/free-illustration-image-thorn-painting-acacia-karroo-hayne-vachelliaFree Image from public domain licenseThe Anti-Slavery Society Convention, 1840, by Benjamin Robert Haydon (died 1846), given to the National Portrait Gallery… https://www.rawpixel.com/image/7666291/image-art-vintage-public-domainFree Image from public domain licenseU.S. Navy optometrist Lt. Cmdr. Randy Birt (left) uses an ophthalmoscope to check the retina of a Tongan woman at a medical… https://www.rawpixel.com/image/8742498/photo-image-public-domain-woman-personFree Image from public domain license