Bureau of Mines, Dept. of Int., between 1910 and 1920. Man placing samples in a furnace. The United States Bureau of Mines (USBM) was the primary US government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.

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Size: 7649px × 8202px
Photo credit: © Heritage Images / Alamy / Afripics
License: Licensed
Model Released: No

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