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<br />4. u.s. Geological Survey, 7.5-Minute Series Topoqraphic <br />Maps, Scale 1:24,000, Contour Interval 10 feet: Boulder, <br />Colorado (1966), Photorevised (1971); El Dorado Springs, <br />Colorado (1965); Photorevised (1971); Louisville, <br />Colorado (1965); Photorevised (1971); Niwot, Colorado <br />(1967), Photorevised (1971) <br /> <br />5. U.S. Army Corps of Engineers, Special Flood Hazard <br />Information Report, Boulder Creek, City of Boulder, <br />Colorado, May 1972 <br /> <br />6. ------------, Omaha District, Flood Plain Information, <br />Boulder Creek and South Boulder Creek, Volume II Boulder <br />Metropolitan Region, Colorado, August 1969 <br /> <br />11 <br />