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Gold ores --- Ore deposits --- Geology --- Colorado
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Aquifers --- Groundwater --- Water-supply --- Measurement --- Measurement. --- Colorado
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Water resources development --- Reservoirs --- Colorado River Watershed (Colo.-Mexico) --- Regulation
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Aquifers --- Groundwater --- Water-supply --- Groundwater. --- Water-supply. --- Measurement --- Measurement. --- Colorado
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Gold ores --- Ore deposits --- Ore deposits. --- Geology --- Geology. --- Colorado
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Water resources development --- Reservoirs --- Colorado River Watershed (Colo.-Mexico) --- Regulation
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Geology --- Mines and mineral resources --- Geology. --- Mines and mineral resources. --- Colorado
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Geology, Stratigraphic --- Geology, Structural --- From 2 to 140 million years ago --- Colorado --- United States
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Ammonoidea --- Fossils --- Paleontology --- From 230 to 570 million years ago --- Colorado. --- United States.
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