A worker from the Bureau of Mines documenting a coal sample collected as part of war work and investigations by the government. The systematic collection of coal samples has aided the government and manufacturers involved in munitions production. This photograph was taken in November 1918 and is numbered 56639. The chief mechanical engineer of the bureau, Hood, supervised this work.

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

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