A worker collecting a coal sample for the Bureau of Mines during World War I. The sample is finely crushed and reduced in size. This was part of the systematic collection of coal samples for war work. Photograph taken by the Bureau of Mines in November 1918.

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Size: 8448px × 5862px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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