Keywords: "Truck mounted drill rig used by Six Companies in upper portion of diversion tunnels. Rig is seen in the position in... - NARA - 293641.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 293641 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 1932-04-20 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-BC21174 Other versions <gallery> File Truck_mounted_drill_rig_used_by_Six_Companies_in_upper_portion_of_diversion_tunnels _Rig_is_seen_in_the_position_in _-_NARA_-_293641 tif tif File Truck_mounted_drill_rig_used_by_Six_Companies_in_upper_portion_of_diversion_tunnels _Rig_is_seen_in_the_position_in _-_NARA_-_293641 jpg jpg </gallery> NARA-cooperation PD-USGov Drilling rigs Men at work in the United States Construction of the Hoover Dam |