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U.S. Department of Energy: DSC_3440
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U.S. Department of Energy: DSC_3442
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U.S. Department of Energy: DSC_3443
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U.S. Department of Energy: DSC_3472
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U.S. Department of Energy: IMG_0834
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U.S. Department of Energy: IMG_0870
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U.S. Department of Energy: IMG_0905
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U.S. Department of Energy: IMG_0908