p.4 #795 Portion of gravel pits on Arizona side of the river, 11 miles above damsite. Hills in background are across the river in Nevada, 5 miles away. Jan. 16, 1932. p.4 #902 Close-up of drag line loading 30 cub yard Western side-dump car. Plymouth gasoline locomotive switching. Feb. 10, 1932. p.4 #906 Marion electric drag line with 5 cubic yard capacity bucket, loading gravel. Feb. 10, 1932. p.4 #904 First train loaded with gravel leaving gravel pits for screening plant. Feb. 10, 1932.

p.5 #948 Foundations for the trash rack structure being installed in front of upper portal of Diversion Tunnel no.2. This is where the first pay concrete was poured. Mar. 7, 1932. p.5 #943 View of gravel plant, showing live storage of screened aggregate and sand in foreground. Storage pile for raw aggregate in background. Mar. 2, 1932. p.5 #951 Upper portals of Diversion Tunnels No.1 and 2. Note workmen scaling above portal of Diversion tunnel No.1. Mar. 7, 1932. p.5 #937 Night view of gravel plant, taken near first scalping screen, and looking in opposite direction than the view on left. Feb. 26, 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

p.21 #1506 Blast on Cableway bench excavation, on Arizona side, above dam site. Picture taken from lower portal of Railroad Tunnel No.1. Aug. 24, 1932. p.21 #1457 Picture of blast at same place shown above, taken from opposite, on Black Canyon Highway. Aug. 16, 1932. p.21 #1507 Huge billows of rock and dust pour over canyon rim and descend to river below. Aug. 24, 1932. p.21 #1456 Blast on Arizona intake tower excavation, which has filled canyon with smoke and dust. Upper steel suspension bridge shown in background. Aug. 16, 1932.

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.