7 lin. ft. of research collection (1890-2012) The collection is divided into two subgroups, Fred E. Miller and Nancy Fields O'Connor.

The Fred E. Miller subgroup (1890-1937 bulk dates). Subgroup include correspondence between family members and others (Fred Miller, Hulda Miller Fields, Ruth Miller, Carrie Doughty, Emma Miller, Lucia Brown, Myrtle Throssell, Robert A. Miller, Ida Fields, Wilbur Throssell, Carl Rankin, Bill Heuthal, E.T. Benson, Fred H. Kennedy, Richard E. McArdle, P.D. Hanson, Robert D. Hostetter, Mrs. Clem W. West, C. Swebb, M.H. Wolf, Scotta Lotta Ramsey, G.I. Porter, Caroll O'Connor, Hal Hick), legal documents for Rosebud County, orignal manuscripts by Hulda Miller, clippings, and depositions, correspondence and other documents pertaining to the case of US vs. Moses P. Wyman. See Box 3 Folder 4 for a detailed listing of items in this subgroup.

The second subgroup, the Nancy Fields O'Connor research collection (1907-2012) includes material compiled on Fred Miller. Includes notes on his work, including photocopies of original documents, arranged and labeled in folders. Nancy O'Connor researcher. The collection holds documents related to the life of the collection itself. In addition to the Miller family correspondence and Bureau of Indian Affairs records, the manuscript materials includes collection exhibition correspondence, book manuscript documentation, and publication references.