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Groundwater --- Groundwater. --- Colorado --- Wyoming
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Uraninite --- Uraninite. --- Colorado
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Geology --- Ore deposits --- Colorado
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Geology --- Ore deposits --- Geology. --- Ore deposits. --- Colorado
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Groundwater --- Groundwater --- Groundwater --- Colorado --- Wyoming --- Wyoming
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Rare earth metals --- Thorium ores --- Colorado
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Coal --- Analysis. --- Colorado. --- North Dakota. --- South Dakota. --- Texas.
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Coal --- Analysis. --- Colorado. --- North Dakota. --- South Dakota. --- Texas.
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Geology --- Petrology --- Geology. --- Petrology. --- San Juan Mountains (Colo. and N.M.) --- Colorado. --- United States
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