Public domain photograph of Washington DC, 1910s-1920s America, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of an aircraft, assembly line, industrial facility, 1930s aviation, free to use, no copyright restrictions.
Picryl description: Public domain image of an industrial building, factory, workshop, workers, 19th-20th century, free to use, no copyright restrictions.
Public domain photograph - United States during World War Two, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of a factory, plant, manufacture, assembly line, industrial facility, early 20th-century industrial architecture, free to use, no copyright restrictions.