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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, and Maginnis mining companies, This collection is arranged into several major subgroups. The first group is for the Holter Family and allied families. The second major group is for the Holter Family Enterprises. The remainder of the collection consists of records of numerous companies grouped together in categories, including Mining subgroups, Lumber and Timber subgroups, Agriculture subgroups, Real Estate and Investment subgroups, Mercantile subgroups, Oil subgroups, Utility and Transportation subgroups, and Miscellaneous subgroups. Within each subgroup the basic arrangement is alphabetical by the name of the company., The Holter Family Subgroup of the collection contains correspondence and other materials relating to individual family members. Within this subgroup is a series of family correspondence, which contains letters written between various Holters. The correspondence between Anton M. Holter and his sons, primarily Norman, Edwin, and Aubrey, and the correspondence between the three brothers, provides invaluable information concerning the many facets of the family's business activities and investments. Therefore, researchers are encouraged to read this family correspondence regardless of the topic of interest., The greatest value of the collection is its completeness and its century-long time span coverage. The materials serve to provide invaluable information on the Holter family; the family companies, particularly the A.M. Holter Hardware Company; the growth and development of Helena and vicinity; and the lumber, ranching, and mining industries in the Northwest. The only weakness in the collection is the lack of any meaningful materials documenting the political activities of the period. The name index accompanying this inventory is not meant to be a complete listing of all materials in the collection, but attempts to provide some guidance in relating companies and individuals. No effort was made to include the three main Holters, Anton, Norman, or Jeff, in the index. (Manuscript Collection 80).

Business records of North Butte Mining Company. Core of the collection consists of interoffice correspondence (1906-1923) between the general manager in Butte, Mont., and the president and secretary-treasurer in Duluth, Minn., and New York. The correspondence includes annual and quarterly reports and weekly letters which all describe development work and production in considerable detail. The remainder of the interoffice correspondence deals with general problems of operation of the mines. There is also general correspondence (1906-1907, 1914-1926) with equipment suppliers, other mining companies, and a wide variety of other letters. Of special interest are files of letters inquiring about possible victims of the Granite Mountain and Speculator disasters. In addition, there are a small number of assay reports, ore shipment statements, and estimates of ore reserves; legal documents; lists of mining claims; articles of incorporation; and a scrapbook of clippings about the Granite Mountain Mine explosion (1915) and fire (1917).