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Power resources --- Natural gas --- Petroleum --- Coal --- Prospecting --- Special issues --- Volcanic ash, tuff, etc. --- Geological time --- Geochemistry --- Power resources - Front Range (Colo. and Wyo.) --- Natural gas - Prospecting - Front Range (Colo. and Wyo.) --- Petroleum - Prospecting - Front Range (Colo. and Wyo.) --- Coal - Front Range (Colo. and Wyo.) --- Volcanic ash, tuff, etc. - Arizona - Chiricahua Mountains. --- Geological time - Arizona - Chiricahua Mountains. --- Geochemistry - Arizona - Chiricahua Mountains.
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