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Home > Using Geologic Maps > Reading Significant Sand and Gravel Aquifer Maps > Figure 4



Figure 4. Title block from a Significant Sand and Gravel Aquifers map. Note the open-file number and date in the lower right corner. Due to continuing data collection and the resulting changes in aquifer boundary interpretation over time, it is important to always use the most up-to-date map. PDF files of all current significant aquifer maps are online.


Last updated on October 6, 2005