Public domain
Oil field worker examining mud to determine characteristics of stratum through which drilling is being done, Seminole oil field, Oklahoma
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineOil field worker examining mud to determine characteristics of stratum through which drilling is being done, Seminole oil field, Oklahoma. 1939-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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