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Hydrogenation and liquefaction of coal.

Technical and economic study of drying lignite and subbituminous coal by the Fleissner process

Hydrogenation and liquefaction of coal.

Hydrogenation and liquefaction of coal.

Hydrogenation and liquefaction of coal.

Bureau of Mines research on the hydrogenation and liquefaction of coal and lignite

Hydrogenation and liquefaction of coal.

Effects of moisture on float-and-sink testing of lignite


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