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<br />Figures - continued <br /> <br />33 Big Sandy River source of salt loading <br />34 Blue Springs Unitt Arizona. Canyon areat vicinity of <br />Gold Hill above Blue Springs . . <br />35 Aquatrain............ <br />36 Layout of evaporation test ponds <br />37 Historical salinity levels <br />38 SCS onfarm improvements . . . . . . . . . . . . . . . . . <br />39 and 40 SCS testing land leveling and sprinkler irrigation. <br />41 Fruit of the Colorado River Basin . . . . . . . . . . . . <br /> <br />viii <br /> <br />Page <br />92 <br />96 <br />102 <br />105 <br />109 <br />112 <br />113 <br />123 <br />