The negatives series, 1930-1974, contains photographic negatives from Ullom's photography studio in Las Vegas, Nevada. The negatives primarily consist of his work as a wedding chapel photographer, but also contain photographs of projects that may pertain to early Nevada, Boulder Dam, and the Nevada Test Site.
Caption at bottom of image reads: "Boulder Dam- downstream face and Nevada lookout point with Fortification Mountain in the background." Boulder Dam was officially re-named Hoover Dam in 1947.
An image of Rotary Club members having lunch at Boulder Dam while Governor Vail Pittman gives a speech. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of four men (including Governor Herbert Ham) listening to a speech during the Boulder Dam decennial event. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of Boulder Dam with open jet flow gates (outlet works). The name was officially changed to Hoover Dam in 1947. Text on postcard reads: "Boulder Dam - upstream face."