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we <br />UTAH <br />ARIZONA <br />i <br />NEW MEXICO <br />Figure 1. The hydrologic subregions of the upper Colorado <br />River basin (After Iorns et al 1965) <br />3 <br />SCALE IN KILOMETERS <br />O 50 100 ISO too 250 <br />O 50 100 150 <br />SCALE IN MILES