A group of workers is shown collecting coal samples during war work and the Bureau of Mines activities. The samples are carefully mixed and reduced, with a portion being saved for further analysis. This photo was taken in November 1918.

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

Keywords: .., 1918, activities, american, bureau, carefully, coal, collection, description, military, mines, mixed, nov., photograph, photographer, reduced, sample, samples, saving, systematic, war, work, world