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Distribution of coal types (anthracite, bituminous coal, subbituminous

Sub-Bituminous Coal Stock Photo - Alamy

Humic coal series: Mineral information, data and localities.

World Resources And Their Distribution - UPSC

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Black 6.74% Bituminous Steam Coal, For Boilers, Packaging Type: Loose

Bituminous Coal, containing Animal Remains - British & Exotic Mineralogy

Sub-bituminous coal - Energy Education