The bulk of the collection consists of the official record from the public hearing held in Helena from November 18 through December 7, 1946, and the exhibits presented to the examiner by both sides during the hearing. There was a total of 176 exhibits (index in Box 4), including maps, graphs, charts, photographs, letters, journals, articles, logs, newsclippings, court records, and legal documents dating from 1821 dealing with the issue of the navigability of the Missouri River. The collection contains only a portion of the numbered exhibits: all those presented by the Federal Power Commission, but only a selected few of those which were presented by the Montana Power Company. In addition to the numbered exhibits, there are miscellaneous materials of a similar nature at the end of the collection. All of the materials in the collection are photocopies of the originals.