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Tunnels
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Slide of downstream face of Hoover Dam, circa late 1930s
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Photograph of outlet works at Hoover Dam, circa late 1930s-1940s
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Film transparency of Hoover Dam's downstream face, circa mid 1930s
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Film transparency of Hoover Dam construction, circa 1931-1933
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Photograph of open valves at Hoover Dam, circa 1934-1936
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Photograph of open valves at Hoover Dam, circa 1934-1936
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Film transparency of penstock tunnel, Hoover Dam, circa 1937-1940
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Postcard of downstream face of Hoover Dam, circa 1934-1935
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Photograph of downstream face of Hoover Dam, Colorado River, Black Canyon, circa 1935
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Postcard of downstream face of Hoover Dam, circa 1934-1935
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Photograph of downstream face of Hoover Dam, Colorado River, Black Canyon, circa 1935
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Aerial photograph of Hoover Dam, Colorado River, Black Canyon, circa 1934-1935
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Aerial photograph of Hoover Dam, Lake Mead, Black Canyon, circa 1934-1935
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Postcard showing downstream face of Hoover Dam, circa 1935
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Photograph of final wall of penstock, Hoover Dam, circa 1930-1935
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Photograph of downstream face of Hoover Dam, circa 1935
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Photograph of construction on Hoover Dam diversion tunnels, circa 1930-1935
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Photograph of construction on Hoover Dam diversion tunnels, circa 1930-1935
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