The Montana Chamber of Commerce was founded as Montanans, Inc. in 1931 to promote business and professional interests and industrial development. The name was changed in 1946. Records (1931-1967) include general correspondence, financial records, legal documents, minutes, news releases, organizational records, printed materials, reports, speeches, subject files, and miscellany.

John T. Murphy (1842-1914) was a Helena, Montana, merchant, rancher, banker, and mine investor. Collection (1865-1935) includes correspondence, financial records, legal documents and other material of Murphy, the Murphy Estate, and various companies he founded, including the Powder River Land and Cattle Company, Montana Cattle Company (Seventy-Nine Ranch), and the Murphy-Maclay Hardware Company.