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0718 <br />.UNITED STATES DEPARTMENT OF THE INTERIOR" <br />GEOLOGICAL SURVEY <br />HYDROLOGIC EFFECTS OF REDUCING IRRIGATION TO MAINTAIN <br />A PERMANENT POOL IN JOHN MARTIN RESERVOIR, <br />ARKANSAS RIVER VALLEY, COLORADO <br />By <br />Richard R. Luckey <br />U.S. Geological Survey <br />Prepared by the <br />U.S. GEOLOGICAL SURVEY <br />in cooperation with the <br />COLORADO WATER CONSERVATION BOARD <br />and the <br />DIVISION OF WATER RESOURCES, OFFICE OF THE STATE ENGINEER <br />and the <br />SOUTHEASTERN COLORADO WATER CONSERVANCY DISTRICT <br />1975 <br />