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w <br />CENTRAL <br />REGION <br />SOUTHEASTERN <br />REGION <br />N <br />A <br />EXPLANATION <br />PROPOSED STUDY UNIT-- <br />and identification number. <br />I PROPOSED STUDY UNIT--to be <br />started in fiscal year 1991 <br />and identification number. <br />REGIONAL BOUNDARIES <br />0 500 MILES <br />0 500 KILOMETERS <br />Figure 1. - Location of proposed study units for the National Water-Quality Assessment Program.