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1. Breakthrough at tunnel 7, Garrison Dam site Breakthrough at tunnel 7, Garrison Dam site Dams; Construction; Tunnels; Men working on the downstream side of tunnel seven at the Garrison Dam construction site finally meet up with the workers on the upstream side. A photographer and other men wearing hardhats are there to...

2. Breakthrough of tunnel seven, Garrison Dam construction site Breakthrough of tunnel seven, Garrison Dam construction site Dams; Construction; Firsts; A man exits a hole in tunnel seven at the Garrison Dam construction site from the downstream site, and is greeted by photographers and other men on the other side.

3. Breakthrough at tunnel 7, Garrison Dam site Breakthrough at tunnel 7, Garrison Dam site Dams; Construction; Tunnels; An assembled crowd watches while men breakthrough in tunnel seven of the Garrison Dam construction site. Two men stand at the top of a staircase that leads up to the hole connecting the upstream and downstream...
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