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<br />The State of the Colorado River <br />Ecosystem in Grand Canyon <br /> <br />A Report of the Grand Canyon <br />Monitoring and Research Center <br />1991-2004 <br /> <br />Edited by Steven P. Gloss. Jeffrey E. Lovich. and Theodore S. Melis <br /> <br />USGS Circular 1282 <br /> <br />U.S. Department of the Interior <br />U.S. Geological Survey <br />