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62. Selected reports that include computer programs produced by the U.S. Geological Survey for simulation of ground-water flow and quality
63. Regional Aquifer-System Analysis Program of the U.S. Geological Survey--bibliography, 1978-86
64. Water use in the United States, 1980
65. HST3D : a computer code for simulation of heat and solute transport in three-dimensional ground-water flow systems
66. Numerical simulation of advective-dispersive multisolute transport with sorption, ion exchange, and equilibrium chemistry
67. Precision of the measurement of pH and specific conductance at National Atmospheric Deposition Program monitoring sites, October 1981-November 1983
68. Results of the U.S. Geological Survey's second international interlaboratory analytical comparison study : standard reference water samples M-86 (major constituents), T-87 (trace constituents), and P-5 (precipitation snowmelt)
69. Precision and bias of selected analytes reported by the National Atmospheric Deposition Program and National Trends Network : 1983 and January 1980 through September 1984
70. Precipitation-runoff modeling system : user's manual
71. Quality-assurance data for routine water analysis in the laboratories of the U.S. Geological Survey for water-year 1983
72. Simulation of dynamic floodflows at gaged stations in the southeastern United States
73. Statistical summary of daily values data and trend analysis of dissolved-solids data at National Stream Quality Accounting Network (NASQAN) stations
74. Quality-assurance data for routine water analysis in the laboratories of the U.S. Geological Survey : 1981 annual report
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