This collection consists of the papers of Hubert Alfred Simmons and is divided into five subgroups: Hubert Alfred Simmons, Eagle Coal Company, Owl Mining Company, W.B. Innes and Co., and Western States Coal Company. Maps, photographs, and printed material have been transferred to the Library Map Collection, Photograph Archives, and Library respectively.

The Hubert Alfred Simmons Subgroup documents Simmons' family and professional life, and is comprised of general correspondence (1906-1956), including letters concerning his family, legal practice, legislative concerns, Helen Simmons, military service; etc.; miscellaneous correspondence (1944); financial records (1936); legal documents (1912-1948); reports (1916-1920); speeches (1911, 1939; undated); subject files (1928-1967); writings (1906, 1967); miscellany (1928-1967, undated); and clippings.

The Eagle Coal Company Subgroup is comprised of general correspondence (1918-1945), arranged alphabetically by correspondent, dealing primarily with coal sales in Montana, North Dakota, and Washington. These letters, to and from coal dealers and distributors, touch upon matters such as type and quality of coal mined, labor relations and other day-to-day problems of coal mining. Also included are financial records (1918-1947), including payrolls; legal documents (1920-1940); maps (1927-1930); minutes (1919-1931); organizational records (1918-1945), including stock certificates; production records (1920-1934); reports (1919, 1943), including an account of the Smith Mine disaster; subject files (1919-1941), pertaining in part to the Bituminous Coal Producers Board for District No. 22 of the National Bituminous Coal Commission, and the Montana Coal Operators Association; and miscellany (1918-1935).

The Owl Mining Company Subgroup consists of interoffice correspondence (1931-1949), financial records (1930-1958); and legal documents (1930-1948).

The W.B. Innes and Co. Subgroup is comprised of financial records (1919-1930), legal documents (1919); minutes (1919-1922); and organizational records (1919-1922).

The Western States Coal Company Subgroup includes general correspondence (1919-1928), financial records (1917-1919), and organizational records (1917-1919).