Image:Us coal regions 1996.png

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United States coal regions with provinces shown.

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Public Domain

This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy.

http://pubs.usgs.gov/of/1996/of96-092/index.htm

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