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Identification of the groundwater resources used for drinking-water supplies is essential for the design of strategies to manage those resources. In this study, the spatial extent, depths, thicknesses, and volumes of groundwater aquifers used for domestic and public drinking-water supply were estimated from locations and well-construction data from 11,725 domestic-supply wells and 2,376 public-supply wells in the Central Valley, California....
An atlas of mosaiced map sheets derived from the U.S. Army Corps of Engineers mapping program between 1917 and 1923. The atlas contains 18 map sheets. After each successive page of 1923 mapping, the same area is displayed with 2005 National Agricultural Imagery Program (NAIP) imagery. Comparison between these two image sets reveals substantial changes over the the last century,...