5 media by topic ∙ page 1 of 1
Oil field worker examining mud to determine characteristics of stratum...
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.
Examining mud from bottom of hole to determine characterisitcs of stra...
Public domain photograph of Oklahoma, United States, free to use, no copyright restrictions image - Picryl description