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Analytical and Numerical Simulation of <br /> the Steady-State Hydrologic Effects of <br /> Mining Aggregate in Hypothetical <br /> Sand-and-Gravel and Fractured <br /> Crystalline-Rock Aquifers <br /> By L.R. Arnold, W.H. Langer, and S.S. Paschke <br /> U.S. GEOLOGICAL SURVEY <br /> Water-Resources Investigations Report 02-4267 <br /> Denver, Colorado <br /> 2003 <br />