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Anthracite coal
Anthracite coal
An anthracite pile in Trevorton, Pennsylvania
An anthracite pile in Trevorton, Pennsylvania
Anthracite coal from Ibbenb├╝ren, Germany
Anthracite coal from Ibbenb├╝ren, Germany
Anthracite from Bay City, Michigan
Anthracite from Bay City, Michigan
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Bituminous coal, the most common coal grade
Bituminous coal, the most common coal grade
Coastal exposure of the Point Aconi Seam in Nova Scotia
Coastal exposure of the Point Aconi Seam in Nova Scotia
Coal miner in Britain, 1942
Coal miner in Britain, 1942
Coal production of the world in 1908 as presented by The Harmsworth atlas and Gazetter
Coal production of the world in 1908 as presented by The Harmsworth atlas and Gazetter