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Portion of railroad leading to Hoover [Boulder] Dam. Workers can be seen in the background, with wheelbarrows and various materials in the foreground.

Ray Lyman Wilbur drives the final silver spike into the ground at the railroad junction of Salt Lake RR at Boulder. Other men gather around as spectators, all wearing suits and ties.

Widening a railroad tunnel between Las Vegas and Caliente. The plan was to double track the Union Pacific Railroad (U.P.R.R.), but the Great Depression occurred and work was never completed. Iowa civil engineer John Muceus is working on the project.

Unidentified men sitting underneath a tent at a railroad survey camp in Clark County, Nevada.

A distant view of wagons and teams used for railroad survey in Clark County, Nevada.

Unidentified members of a railroad survey crew seated on horses in Clark County, Nevada.

Black and white picture of a pit mine near Ruth, Nevada.