Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description
Public domain scan of a print featuring furniture, art, or architecture design, free to use, no copyright restrictions image - Picryl description
Public domain photograph of electrical equipment, power lines, engine, free to use, no copyright restrictions image - Picryl description
Public domain photograph of 19th-century painting, free to use, no copyright restrictions image - Picryl description