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<br /> <br />DAMS AND RIVERS <br /> <br />A Primer on the Downstream Effects of Dams <br /> <br />By MICHAEL COLLIER. ROBERT H. WEBB. and JOHN C. SCHMIDT <br /> <br />U.S. GEOLOGICAL SURVEY <br />Circular 11 26 <br /> <br />Tucson. Arizona <br />June I 996 <br />