Hoover DamHoover Dam was designed to last 2000 years and was built in the height of The Great American Depression. It's weight is 6,600,000 tons - height is 726 - 45 feet thick at the top and 660 feet thick at the base.
Photo: Richard Strange
postmarked in 2009 with two stamps, one of a clock for 10c and the other with a ram for 17 cents
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