Public domain photograph of 19th-century vintage card, free to use, no copyright restrictions image - Picryl description
Public domain photograph of rural California, dust bowl refugees, 1930s-1940s, no copyright restrictions image - Picryl description
Public domain photograph of rural landscape, California, no copyright restrictions image - Picryl description
Picryl description: Public domain image of a quarry, excavation or mining site, free to use, no copyright restrictions.
Public domain scan of a architecture diagram, settlement map, plan, or drawing, free to use, no copyright restrictions - Picryl description.
Picryl description: Public domain image of a coal mine, mining, free to use, no copyright restrictions.