Image: Coal miner spraying rock dust
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Description: A coal miner in West Virginia spraying rockdust to reduce the combustible fraction of coal dust in the air.
Title: Coal miner spraying rock dust
Credit: https://www.flickr.com/photos/niosh/8743393753/
Author: National Institute for Occupational Safety and Health
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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