Public domain (cc-zero, image retrieved via Wikimedia Commons), Title: “Jackhammers on west side bedrock.” Photo: Unknown Photographer; Date: October 1935; Record ID: National Archives Identifier (NAID) 294083, Record group: Record Group 115: Records of the Bureau of Reclamation, 1889–2008 (National Archives Identifier: 444), Series: Photograph albums, compiled 1903–1972 (National Archives Identifier: 293611, NAIL Control Number: NRG-115-CONSTPHO85006-COLBASIN2795;Source/Collection: U.S. National Archives and Records Administration; Description: Scope and content: Photograph from Volume Two of a series of photo albums documenting the construction of the Grand Coulee Dam and related work on the Columbia Basin Project.
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