- 0054-001-001 - Homestead Days essay
- 0113-001-001 - William H. Storrs diary
- 0124-001-001 - Laura Brown Zook reminiscence
- 0216-001-001 - Frank T. Kelsey papers
- 0216-001-002 - Frank T. Kelsey family photographs
- 0244-001-001 - James David Wood autobiography
- 0308-001-001 - Michael Langohr Diary
- 0325-001-001 - Campbell Family Papers
- 0325-001-002 - Campbell Family legal documents
- 0343-001-001 - W.W. Wylie autobiography
- 0343-001-002 - W.W. Wylie related materials
- 0368-001-001 - Early Settlers of Salesville, Spanish Creek and Cherry Creek Basins manuscript
- 0368-002-001 - Early Settlers of Salesville, Spanish Creek and Cherry Creek Basins map
- 0431-001-001 - A. V. Howard narrative
- 0492-001-001 - Lieutenant Gustavus C. Doane report on the Yellowstone Expedition
- 0498-001-001 - Lorenzo B. Lyman autobiography
- 0507-001-001 - Fred E. Server diary
- 0507-001-002 - Transcript of the Fred E. Server diary
- 0515-001-001 - William H. White diary
- 0518-001-001 - Richard D. Cotter papers
- 0540-001-001 - Maxey Mines annotated research paper
- 0541-001-001 - Elizabeth Berger Swan papers
- 0591-001-001 - Arner Nelson reminiscence
- 0642-001-001 - Victor E. George reminiscence
- 0825-001-001 - Joseph Kipp letter to Colonel Guido Ilges
- 0866-001-001 - John Jacob Benepe papers
- 0875-001-001 - Montana Horse Breeders Association records
- 0902-001-001 - Floyd T. Wood weather diary
- 1105-001-001 - Milo Herrick Spaulding photograph album
- 1112-001 - DelĀ JenkinsĀ oral history
- 1119-001-001 - Charles W. Baker diary
- 1412-001-001 - Nelson Story, Sr., letter
- 2266-001-001 - Myrtle Shipe Yellowstone Park diary
- 2301-001-001 - Gallatin Valley Female Seminary essay
- 2429-001-001 - Gallatin County Poor Fund warrant register
- 2456-001-001 - Louis Agassiz letter to Franklin Benjamin Hough
- 2456-001-002 - Louis Agassiz letter to John Whipple Potter Jenks
- 2456-001-003 - Photogravure portrait of Louis Agassiz
- 2481-001-001 - Elise Furer Musser Yellowstone and Alaska tourist letters
- 2520-001-001 - Evelyn Webb Carpenter diary
- 2561-001-001 - Omega Beta photograph album
- 2605-001-001 - Myrtle May Crosby letters
- 2636-001-001 - Belle McDonald cookbook
- 2636-001-002 - Modern Homemaker
- 2642-001-001-img01-hres - Ted DuPont (right) and Jim Vavrinchik (left)
- 2642-001-001-img02-hres - Jim Vavrinchik on the Beartooth Highway
- 2642-001-001-img03-hres - The DuPont/Vavrinchik motorcycle parked in front of the Pirsig residence
- 2642-001-001 - Robert Pirsig letter to Ted DuPont
