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| Keywords: "Cleaning rock floor preparatory to pouring invert concrete in diversion tunnel No. 4. Tractor bulldozer in... - NARA - 293699.tif Scope and content Photograph from Volume Two of a series of photo albums documenting the construction of Hoover Dam Boulder City Nevada General notes 293699 Local identifier Department of the Interior Bureau of Reclamation Engineering and Research Center 05/18/1981 - 03/04/1988 NARA's Rocky Mountain Region Denver NRGA Building 48 Denver Federal Center West 6th Avenue and Kipling Street Denver CO 80225-0307 1932-07-01 Record group Record Group 115 Records of the Bureau of Reclamation 1889 - 2008 Record group ARC 444 Photograph albums compiled 1903 - 1972 Series ARC 293611 File unit File unit ARC Variant control numbers NAIL Control Number NRG-115-CONSTPHO85006-BC21316 yes Other versions <gallery> File Cleaning_rock_floor_preparatory_to_pouring_invert_concrete_in_diversion_tunnel_No _4 _Tractor_bulldozer_in _-_NARA_-_293699 tif tif File Cleaning_rock_floor_preparatory_to_pouring_invert_concrete_in_diversion_tunnel_No _4 _Tractor_bulldozer_in _-_NARA_-_293699 jpg jpg </gallery> NARA-cooperation PD-USGov NARA TIF images with categorized JPGs | ||||