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The top documents tagged [ti tfti t]
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Energy Resources. Geothermal Energy: A Free Lunch? Environmental Problems of Geothermal Energy It is Finite Heat Sources Can Be Exhausted (Geysers, California)
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Earth Resources. Mineral Resources Building Stone, Sand, Gravel, Limestone Non-metallic Minerals Sulfur, Gypsum, Coal, Barite, Salt, Clay, Feldspar, Gem
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Energy. Energy Use, California, 1972 Energy Use, California, 1979
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