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Geology --- Zinc ores --- Zinc mines and mining --- Colorado.
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Physical geography --- Glaciology --- Water-supply --- San Juan Mountains (Colo. and N.M.) --- Colorado. --- United States
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Geology --- Zinc ores --- Zinc mines and mining --- Zinc mines and mining. --- Zinc ores. --- Colorado.
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Physical geography --- Glaciology --- Water-supply --- Physical geography. --- Water-supply. --- San Juan Mountains (Colo. and N.M.) --- Colorado. --- United States
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