california plaque hoover dam nevada arizona |
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| navigate by keyword : black 1936 states canyon dedicated franklin roosevelt concrete wikipedia california plaque colorado arch 1935 president depression september great constructed gravity was arizona border hoover descriptionhoover dam river 1931 nevada |
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| DescriptionHoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30, 1935, by President Franklin D. Roosevelt. - Wikipedia |
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