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- #774 - 3¢ Boulder Dam: Plate Block
#774 - 3¢ Boulder Dam: Plate Block
When completed in 1936, Boulder Dam was both the world's largest electric-power generating station and the world's largest concrete structure. Later renamed for Herbert Hoover, the dam is located 30 miles southeast of Las Vegas, Nevada and is a popular tourist destination. Scott 774 Boulder Dam
$3.00
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