"#31-56 Secretary Wilbur Driving Silver Spike on Union Pacific Branch Line, Las Vegas to Boulder City, Sept. 17, 1930.
#32-227 Beginning work on Six Companies, Inc.
Railroad & Highway along Colorado River above Cape Horn - May 23, 1931.
#33-229 Six Companies' Temporary Camp at Boulder City, May 22, 1931.
#34-228 Construction of Six Companies' Warehouse at Boulder City - May 23, 1931."
black and white photographs 4 x 5.3 in. or 8 x 4.8 in. paper background 10 x 13.5 in.
Archived TIFF images were scanned by Kathleen Broeder at 400 dpi with an Epson Expression 10000XL scanner. Digital images were reformatted in Photoshop. JPG and PDF files were then created for general use.