Two flowering plants: a phlox (Phlox subulata) above a violet (Viola hederacea) Chromolithograph, c. 1870, after A. F. Lydon. https://www.rawpixel.com/image/13954021/image-flower-plant-artFree Image from public domain licenseBritish fresh water fishes / Rev. W. Houghton ... illustrated with a coloured figure of each species drawn from nature by… https://www.rawpixel.com/image/13969581/image-water-animal-public-domainFree Image from public domain license