The Bottolfsen papers contain a variety of items. There are three boxes of speeches dating from 1926 to 1961, and one box of correspondence dated 1932 to 1964. There are also folders containing items on the American Legion, the Republican Party, and the Rotary, as well as information on the Craters of the Moon National Monument, Abraham Lincoln, and the Idaho Territorial Centennial. Also included are newspaper clippings and scrapbooks.

The thirteen boxes of C.A. Bottolfsen papers have been separated according to type of material, subject or organization concerned. The speeches have been organized by type where possible, however, many speeches are bound in folders. In this case the speeches have been left in their original order. Correspondence has been arranged chronologically where possible. Letters bound in folders have been left in their original order. Newspaper clippings have been organized by subject; entire sections of newspapers have not been arranged. File cards have been made for the Speeches, Correspondence, History and non-newspaper Miscellaneous Series.

In 2022/2023, the collection was refoldered to straighten out folded papers and remove metal fasteners or bindings. This reduced the size by about 1.5 cubic feet. Information contained on file cards is now also incorporated into the finding aid.