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1
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United States. Office of the Assistant Secretary for Fossil Energy -- See Also the earlier heading United States. Office of Fossil Energy
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1
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2
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United States. Office of the Assistant Secretary for Fossil Energy. Office of Coal Utilization -- See United States. Office of Coal Utilization
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1
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3
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United States. Office of the Assistant Secretary for Fossil Energy. Office of Magnetohydrodynamics -- See United States. Office of Magnetohydrodynamics
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1
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