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| Keywords: Drilling jumbo used in upper 36 feet of 41-foot diameter upper penstock header. This view shows the drilling face. - NARA - 293854.jpg Scope and content Photograph from Volume Two of a series of photo albums documenting the construction of Hoover Dam Boulder City Nevada General notes 293854 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 1933-05-10 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-BC21662 Other versions <gallery> File Drilling jumbo used in upper 36 feet of 41-foot diameter upper penstock header This view shows the drilling face - NARA - 293854 tif tif </gallery> NARA-cooperation PD-USGov Drilling machines 1930s Hoover Dam construction equipment Jumbo Rig 1933 in Nevada | ||||
