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Vehicles --- Air quality --- Motors --- Exhaust gas --- Standards --- United States.
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Vehicles --- Air quality --- Motors --- Exhaust gas --- Standards --- United States.
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Automobiles --- Trucks --- Diesel motor exhaust gas --- Air quality --- Motors --- Exhaust gas --- Data processing. --- Standards --- United States.
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Trucks --- Diesel motor exhaust gas --- Automobiles --- Air quality --- Motors --- Exhaust gas --- Data processing. --- Standards --- United States.
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Groundwater --- Radioactive pollution --- Environmental monitoring --- Underground nuclear explosions
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Groundwater flow --- Water-supply --- Watersheds --- Water-supply --- Water levels --- Hydrogeology
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Groundwater flow --- Aquifers --- Groundwater --- Mathematical models. --- Sampling
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Groundwater flow --- Hydrology --- Groundwater recharge --- Water-supply --- Mathematical models. --- Computer simulation.
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Aquifers --- Groundwater --- Groundwater flow --- Hydrogeological surveys --- Hydraulics. --- Great Basin National Park (Nev.) --- Nevada
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