p.7 #969 First-aid station and ambulance located at river camp above upper portals. Similar hospital is maintained at lower portals. Mar, 8, 1932. p.7 #918 Interior of one of many drill sharpening stations, showing forge and Ingersoll-Rand drill sharpener. Feb. 15, 1932. p.7 #974 Caterpillar 60 with bull-dozer in front and cow-dozer aft, used extensively for moving muck. Mar. 8, 1932. p.7 #946 Two levels of highway which will cross top of the dam. Note the rubble stone masonry retaining wall. High-level concrete mixing plant will be located in the draw in foreground. Mar. 2, 1932.

Pg.12 #2437 Upper Portals of the Diversion Tunnels. The dyke being built is at Elevation 690, which was the elevation of the top of the Tunnels. Nov. 30th, 1933. Pg.12 #2438 Close-up of Boulder Dam. The top blocks are at Elevation 715. Nov. 30th, 1933. Pg.12 #2444 Himix Plant. Note the new type of 8 cu. yd. bucket on the car, and the two additional 4 cu. yd. Mixers being installed. De. 1st, 1933. Pg.12 #2446 Arizona Intake Towers. The head tower for No. 10 Cableway is erected and the 180 ft. boom derrick is nearly complete. Dec. 1st, 1933

Pg.30 #2638 Interior view of Poser House block A-7, showing reinforcing steel and pipe layout. April 25th, 1934. Pg.30 #2634 View of Poser House block No. A-7, from the lower Arizona construction unit, showing form work and pouring arrangement. April 25th, 1934. Pg.30 #2660 Looking upstream in Black Canyon, showing general view of the Power House layout, taken from the Nevada Valve House bench. April 28th, 1934. Pg.30 #2629 General view of Himix and Cement Blending Plants, with unloading track and aggregate bins above. April 17th, 1934.

Pg.53 #2905 Central section of the Powerhouse, looking toward the Nevada side, showing the floor level. No. 2 adit car in the extreme background. Oct. 30th, 1934. Pg.53 #2910 Looking downstream into the Arizona Powerhouse, showing location of the turbine rooms, from room galleries, and penstocks. Oct. 30th, 1934. Pg.53 #2908 Nevada Powerhouse, showing the reinforcing and walls around the penstock openings. Pumpcrete machine is in the butterfly valve gallery between the rock abutment and the turbine rooms. Oct. 30th, 1934. Pg.53 #2914 Looking upstream into the pipe gallery in the Nevada Powerhouse, showing beams and concrete. Oct. 30th, 1934.

Pg.73 #3238 Telephoto view of the Arizona Valve House. Apr. 25, 1935. Pg.73 #3234 A telephoto view from the Nevada side, showing some of the Arizona power House roof girders in position. Note the Universal Crane on top. The girder on the flat car has just been lowered by means of the Government Cableway. Apr. 25, 1935. Pg.73 #3237 Telephoto of the Nevada Valve House. Note the forms for the roof beams being built. Apr. 25, 1935. Pg.73 #3245 View taken from the upstream end of No.4 Plug, looking downstream, showing the method of pouring. Apr. 26, 1935.

Pg.76 #3269 Boulder Dam, looking downstream from the Arizona side. May 27, 1935. Pg.76 #3284 Looking in a general downstream direction, on the Arizona Black Canyon Highway, showing Six Companies Inc. road work. May 27, 1935. Pg.76 #3296 Boulder Dam, looking downstream from the Nevada side, showing Spillways and the Intake Towers. June 1, 1935. Pg.76 #3303 View of the open cut portion of the Switchyard Control Circuit Tunnel. Shovel is excavating for the Switchyard, and the building in the foreground is the power sub-station. The Babcock and Wilcox Company plant can be seen in the extreme background. June 1, 1935.