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cl, <br />fqg5 <br /> <br />R-93-20 <br />DEVELOPING A GEOGRAPHIC <br />INFORMATION SYSTEM FOR <br />RESOURCE. MONITORING ON <br />THE COLORADO RIVER IN <br />THE GRAND CANYON <br />September 1993 <br />U.S. DEPARTMENT OF THE INTERIOR <br />Bureau of Reclamation <br />Denver Office <br />Research and Laboratory Services Division <br />Applied Sciences Branch <br />