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Ground Water in the <br />Central Valley, California <br />A Summary Report <br />By GILBERT L. BERTOLDI, RICHARD H. JOHNSTON, and K.D. EVENSON <br />REGIONAL AQUIFER-SYSTEM ANALYSIS CENTRAL VALLEY, CALIFORNIA <br />U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1401-A <br />UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1991