Image: "Arthur Roberts and Sam Mynatt drilling in lateral test shaft for examination of substrata at base of Norris Dam." - NARA - 532678
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Title: "Arthur Roberts and Sam Mynatt drilling in lateral test shaft for examination of substrata at base of Norris Dam."
Credit: U.S. National Archives and Records Administration
Author: Lewis Hine
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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