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<br />. <br /> <br />. <br /> <br />. <br /> <br />o <br />00 <br />.... <br />Ul <br /> <br />Number <br />1 <br />2 <br />3 <br /> <br />4 <br /> <br />5 <br />6 <br /> <br />7 <br /> <br />8 <br /> <br />FIGURES <br /> <br />Quality of water map, Colorado River Bas~n. . , . <br />Flow and quality of water re~ords, 1941-76. , . , <br />Weighted average dissolved-solids concentrations, <br />Colorado River above and below Lees Ferry, <br />Arizona . . . . , . . , . . . . , . . . . . . <br />Investigation and construction schedule, Colo- <br />rado River Water Quality Improvement Program. <br />Colorado River at Lees Ferry--sediment and water- <br /> <br />flow, . . . . . . , . . . , . . . . . . <br />Combined Colorado River near Cisco, Green River <br />at Green River, Utah, and San Juan River near <br />Bluff , . . . . . . . , . . , . . . . , <br />Geohydrologic units in the Upper Colorado River <br />Basin and dominant salinity of natural runoff <br />from those units . . , . . . . . . . . , , . <br />Salinity changes in Lake Powell at Wahweap site <br /> <br />vii <br /> <br />Page <br />Frontispiece <br />41 <br /> <br />47 <br /> <br />72 <br /> <br />108 <br /> <br />109 <br /> <br />114 <br />118 <br />