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Arbeiter im Ölfeld untersucht Schlamm, um die Eigenschaften der Schich...
Picryl description: Public domain image of a construction site, wooden frame, timber, free to use, no copyright restrictions.
A black and white photo of men working on a machine. War Poduction. Of...
Picryl description: Public domain photograph of workers, war production, aircraft, airfield, the 1930s -1940s, free to use, no copyright restrictions.
A black and white photo of a man working on a machine, Great Depressio...
Picryl description: Public domain image of industrial or agricultural worker, 1930s, 20th-century, free to use, no copyright restrictions. show less
A black and white photo of a man standing next to a machine, Great Dep...
Picryl description: Public domain photograph of a car, 1930s, free to use, no copyright restrictions.
Die Untersuchung von Schlamm vom Boden des Bohrlochs, um die Charakter...
Public domain photograph of Oklahoma, United States, free to use, no copyright restrictions image - Picryl description