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<br />UTAH <br />ARIZONA <br />1 <br />2. <br />SCALE IN KILOMETERS <br />0 50 loo 190 !00 250 <br />o 50 loo ISO <br />SCALE IN MILES <br />NEW MEXICO <br />h <br />t <br />V <br />M <br />Figure 1. The hydrologic subregions of The upper Colorado <br />River basin (After Iorns et al 1965)