Abstract Samuel T. Hauser (1833-1914) was a Helena, Montana, Territory, pioneer, territorial governor (1885-1886), and entrepreneur in the fields of banking, mining, smelting, ranching, railroads, irrigation, and hydro-electric power. More than fifty percent of the collection is incoming correspondence (1864-1914). There are also outgoing correspondence, financial records, legal documents, organizational records, and reports. Included are thirty-eight subgroups of the Hauser family and Hauser's...