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Anthracite - Types of Coal
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Coal | National Geographic Society
Coal: Anthracite, Bituminous, Coke, Pictures, Formation, Uses
Coal Rock | History | Origin
unpolished Bituminous coal (black coal) rock Stock Photo by vvoennyy
Coal: Anthracite, Bituminous, Coke, Pictures, Formation, Uses
Bituminous Black Coal Rock - 2 Pieces : Amazon.in: Industrial & Scientific
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Bituminous Coal Sedimentary Rock - Mini Me Geology
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/GettyImages-946072216-5bae4eab4cedfd0026eae392.jpg "Coal in a Nutshell")
Coal in a Nutshell
Anthracite - Types of Coal
Coal - Wikipedia
Eisco Bituminous Coal Specimen:Education Supplies:Earth and Space Classroom | Fisher Scientific
Is coal a sedimentary rock? | Idaho Ask a Scientist
Learning Geology: Coal
Coal - Minerals Education Coalition
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Earth Science - Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur,
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What Is Coal?
