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M.R Campbell "The coal Fields of the United Sates "
US Geological Survey Paper 100-a which offers for Anthracite:
Moisture 3.2% Volatile matter 1.2% Fixed Carbon 95.6% Heat Value 14400 BTU
(As mentioned there, a high rank semibituminous can indeed offer
greater heating value of 15360 BTU at a lower fixed carbon content
83.4% on an ash-free basis, though I fear that this USGS reference is
almost as old as Jack's )