Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey
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Map
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Maps of the Bonsall area of the San Luis Rey River Valley, San Diego County, California showing geology, hydrology, and ground-water quality / by John A. Izbicki
Sheet 1. Well locations -- Sheet 2. Thickness of alluvial fill -- Sheet 3. Water-level contours, November 1983, and hydrographs of selected wells -- Sheet 4. Ground-water quality in spring 1960 and graphs showing changes in dissolved-solids concentration of water from selected wells with time -- Sheet 5. Ground-water quality in spring 1984.