Coal_Rank_USGS.png
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Summary
Description Coal Rank USGS.png |
English:
Diagram of coal ranking system used in the United States (US Geological Survey)
|
Date | |
Source | "An introduction to coal quality", US Geological Survey, Professional Paper 1625-F |
Author | Stanley P. Schweinfurth |
Permission
( Reusing this file ) |
Public domain, product of US federal government |
Licensing
Public domain Public domain false false |
This image is in the
public domain
in the United States because it only contains materials that originally came from the
United States Geological Survey
, an agency of the
United States Department of the Interior
. For more information, see
the official USGS copyright policy
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