Black and white image of Ray Lyman Wilbur, Secretary of the Interior, at a ceremony which inaugurated construction on the Boulder City branch of the Los Angeles and Salt Lake Railroad, signaling the beginning of the Boulder Canyon Project, later known as Hoover Dam. From left to right, the men pictured include: Senator Key Pittman of Nevada; Governor Fred Balzar of Nevada; Carl Gray, President of Union Pacific Railroad system; Secretary Wilbur holding the Nevada silver spike; and Senator Tasker L. Oddie of Nevada. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Typed, itemized estimate of costs for a four room cottage to be built within Clark's Las Vegas Townsite. Document includes item description, material cost, labor cost and total costs for construction and freight. The railroad cottages were built by the Las Vegas Land and Water Company for employees of the San Pedro, Los Angeles and Salt Lake Railroad between 1909 and 1911.