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 business enterprises.
Anton M. Holter (1831-1921) was a pioneer Helena, Montana, lumberman and founder of the A.M. Holter Hardware Company. Papers (1831-1921) include correspondence, and organizational and financial records relating to mining, agriculture, lumber, real estate, and oil interests of three generations of the family, headed successively by Anton M. Holter, Norman B. Holter, and Norman J. "Jeff" Holter. Many of the enterprises were in partnership with Samuel T. Hauser. Interests include the A.M. Holter Hardware Company; Holter Realty; Holter Research Foundation; Judith Farms; Montana Flour Mills; and the Helena and Frisco, Helena and Victor, the Maginnis mining companies, and many others.