| http://www.w3.org/ns/prov#value | - There are also about a dozen Army Corps of Engineers campgrounds (406.526.3411) in the area, particularly in the Recreation Area around 134-mile-long Fort Peck Lake???one of Montana's largest and the fifth largest man-made lake in the United States???and the dam, the largest public works project in the nation when it was built in the 1930s and 1940s.
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