Woman with Child (c.1930) photography in high resolution by Tina Modotti. https://www.rawpixel.com/image/7728810/photo-image-art-public-domain-artworksFree Image from public domain license'Fluid Dynamics,' mixed media by Tina York depicts fluid dynamics studies at the Ames Research Center. Original from NASA.… https://www.rawpixel.com/image/441386/free-photo-image-nasa-mountain-fluidFree Image from public domain licenseMap of the night's march undertaken by the forces of General George B. McClellan after the Battle of Malvern Hill on July 1… https://www.rawpixel.com/image/7659020/image-public-domain-map-brasilFree Image from public domain license