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  • Thermal Technology Source Book by Federal Buyers

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  • Glossary of Mining Terms Kentucky Coal Education

    A. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...

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  • Glossary of Mining Terms Kentucky Coal Education

    A. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...

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    Second only to oxygen, silicon is the most abundant element in Earth's crust. It is found in rocks, sand, clays and soils, combined with either oxygen as ...

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    Copper is one of the basic chemical elements. In its nearly pure state, copper is a reddish-orange metal known for its high thermal and electrical conductivity.

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  • Glossary of Mining Terms Kentucky Coal Education

    A. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...

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