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<br /> <br /> <br /> <br /> <br /> <br />Figure 2. Observed and Expected Changes in Ion and TDS <br />Concentrations in Lake Mead During the 1951-60 <br />and 1970-79 Periods and in Lake Powell During <br />the 1970-79 Periods. (Carbonate Estimated <br />From Bicarbonatej2.03) [18]. [USGS Data]. <br /> <br />8 ,. <br />