Bill Williams's Boy, Whitesburg, Kentucky by Doris Ulmann https://www.rawpixel.com/image/14249115/bill-williamss-boy-whitesburg-kentucky-doris-ulmannFree Image from public domain licenseThe Bullion Mine, Virginia City, Nevada by Carleton Watkins https://www.rawpixel.com/image/14312810/the-bullion-mine-virginia-city-nevada-carleton-watkinsFree Image from public domain license