A man working at the Bureau of Mines during World War I. The Bureau ensured that the coal purchased by the government met specific specifications for its heating value and ash content. This guarantee helped improve the government's war efficiency. The photograph was taken on November 14, 1918.

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Size: 8494px × 5824px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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