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<br />003214 <br /> <br />photographs from 1873 to date. The ri ver systems are very dynamic. Some <br />of the same reaches went from bare spaces to heavy cottonwoods. <br /> <br />Mr. Ken Renard, U. S. Department of Agriculture, Southwest Watershed <br />Research Center, spoke on the Management of Ari zona I s Ranges.. He discussed <br />the research on precipitation, runoff, erosion control and CREAMS. CREAMS <br />is a field scale model for chemicals, runoff, and erosion control from <br />Agricultural Management Systems. <br /> <br />The meeting adjourned at 12:00 noon. <br /> <br />. <br /> <br />B-25 <br /> <br />