118.1 Blurry picture identified as the Colorado River. ; 118.2 Postcard picture showing two airplanes, identified as Las Vegas, Nevada airport. ; 118.3 The silver spike that started work on Hoover Dam. September 17, 1930. ; 118.4 Courthouse for speeches; 9/17/30; 118.5 N.A.E. Transport over Boulder 9-17-30 ; 118.6 Postcard picture showing a mountain scene.