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' U S Geological Survey Professional Paper 1401-C, Geology of the Fresh Groundwater Basin of the <br /> Central Volta, Califomia, with Texture MaRs and &gttotg, 1986 <br /> US Geological Survey Professional Paper 1401-1), Groundwater Flow in the Central_ Valley. <br /> Cali ornia, 1989 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> i <br /> 1 <br /> R 042992 TIL 18 <br />