The People's Voice was a weekly newspaper published in Helena, Montana, by H.S. "Cap" Bruce, and later by Harry L. Billings. Records consist primarily of general correspondence (1937-1966); and subject files (1930s-1960s) on a wide variety of topics, including Montana politics, farmers unions, labor, state government, and public utilities.

The Jumbo Mining and Development Company was a gold mining operation near White Sulphur Springs, Montana. Records (1890-1956) include minutes, bylaws, stock certificates and transfers. Also there are limited amounts of incoming correspondence and financial records. An account book includes a brief history of the company.