The collection is comprised of records of the San Pedro, Los Angeles & Salt Lake Railroad Company (1901-1976). The construction of this railroad led to the founding of Las Vegas, Nevada and the creation of the Empire Construction Company and Las Vegas Land and Water Company. The records document the company's operations and include correspondence and contracts relating to lots in the Las Vegas townsite, payments and accounts, invoices and other audit materials from 1905 to 1923. The collection also includes the records of the railroad agent at Arden Station, located ten miles south of the Las Vegas Station, which contain correspondence, ledgers, freight and way bills, shipping orders, and telegrams.

The JMA Architecture Studio Records are comprised of architectural records (1953-2002) created by the American architect Jack Miller and/or his architectural firm, known as both Jack Miller & Associates, Architects, & Engineers, Inc and JMA Architects, Inc. This collection includes 30.25 linear feet of materials documenting work on over 250 projects. The collection focuses on Las Vegas and Reno, Nevada. The materials feature photographs of the firm’s projects and hand-drawn architectural drawings, ranging from pencil and ink on tracing paper preliminary sketches to ink on Mylar (TM) construction documents. The drawings also contain work from a number of consultants, engineers, and other architects who collaborated on the development of the various projects. The collection includes architectural drawings for hotels, casinos, integrated casino resorts, office towers, multi-family residential developments, and custom single-family homes.