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Jet coal is a form of lignite
Anthracite Coal
Gilsonite (North American Asphaltum) is a natural form of asphalt.
Lignite Coal Sample
Oil Shale Sample
Oil Shale Sample
Sphagnum Peat Moss
Tar Sand and Sandstone Sample
Jet coal is a form of lignite
Jet coal is a form of lignite
Jet coal is a form of lignite
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