This undated view, looking upstream through the Black Canyon, shows the giant concrete forms covering the finished base of the Hoover Dam as construction continued in Boulder City, Nevada. The fleet of trucks used to haul materials for the concrete are seen in foreground. (AP Photo)

15. Процесс создания дамбы в Черном Каньоне. Десятки грузовиков доставляют материалы для строительства. Невада, дата неизвестна. (AP Photo)

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