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<br />. <br /> <br />. <br /> <br />16) U.S. Department of the Interior, Geological Survey, "7.5 <br />Minute Series Topographic Maps" Scale 1 :24,000, Contour <br />Interval 10 feet, Eastlake, Colorado (1980), Arvada, <br />Colorado (1980), Lafayette, Colorado (1979), Golden, <br />Colorado (1980), Louisville, Colorado (1971); Contour <br />Interval 40 feet, Ralston Buttes, Colorado (1971), Eldorado <br />Springs, Colorado (1971). <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />17) Delta Aerial Surveys, "Aerial Mapping of Big Dry Creek and <br />its Tributaries" Scale 1 :2,400 Contour Interval 2 feet, <br />November 1983. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />