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HooverDamHighScaler.jpg(500 × 396 pixels, file size: 54 KB, MIME type: image/jpeg)

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English: High scalers drilling into canyon wall 500 feet above the Colorado River in Black Canyon, site of Hoover Dam, 1932.
Date 13:52, 20 June 2010 (UTC)
(20 June 2010 (original upload date))
Source Transferred from en.wikipedia; transferred to Commons by User:NortyNort using CommonsHelper.
(Original text :
Author Bureau of Reclamation. Original uploader was NortyNort at en.wikipedia
( Reusing this file)



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