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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 -Rack 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 />