The William Mulder papers (1918-2008) consist of his correspondence, articles, original manuscripts, and early diaries.

The A. Milton Musser papers (1952-1948) consist of typescripts of diaries (1852 and 1869 February-April), a handwritten index of Musser diaries (1852-1857), and a biography detailing associations with early LDS Church leaders as well as everyday activities. Collection includes a handwritten letter (dated 1948) about gold coins minted by the LDS in Salt Lake City. Musser was a traveling bishop for the LDS Church from 1858 to 1876.

The MX Information Center records (1976-1986) consist of subject files, alphabetical files, petitions, correspondence, financial records, writings, publications, and other materials. The MX Information Center was an anti-MX and anti-nuclear weapons group in Salt Lake City, Utah.

The Ray Iwao and Margine Mutsuko Sako Nagasawa papers (1953-1960) contains correspondence, Nisei Invitational tournament rosters and booklets, and newspapers relating to the Nisei Invitational tournaments. The collection also includes financial documents relating to the Invitational and the Sunrise Market, as well as two pains of gimbu pants.

The George Nakamura Papers (1922-1992) consist primarily of correspondence to George Nagayuki Nakamura from Japanese American concentration camps and United States military installations during World War II.

The Charles James Neal papers (1911-1991) consists of documents and souvenirs pertaining to Neal's discoveries and experiences while living in Utah. Neal was responsible for constructing the first telephone lines in the Uintah Basin, Utah. He also discovered gilsonite in Ft. Duschesne, Utah.

The Paul Edward Nelson papers (1960-2008) contain correspondence, reports, project proposals, research files, drawings, brochures, pamphlets, notes, articles, and manuscripts documenting Nelson's career as a planning and marketing consultant.

The Neponset Land and Livestock Company records (circa 1890-1899) consist of photocopies of the records of this Evanston, Wyoming, ranching concern.

The Norman D. and Doris Nevills papers (1890s-1952) constitute one of the finest and most comprehensive collections of original research materials on the history of travel on the Colorado and Green Rivers and their tributaries. Included are correspondence, diaries, logs, subject files, news clippings, and business records. Norman Nevills (1909-1949), supported by his wife Doris, was one of the pioneers of commercial river running.

The New Park Mining Company records (1930-1961) contain materials relating to this Utah business. Included in the collection are reports, correspondence, financial information, name lists, bulletins, legislative announcements, invoices, receipts, vouchers, and proxy votes. The New Park Mining Company operated in both Park City and Keetly, Utah.

The New Quincy Mining Company records (1897-1941) consist of three mining property maps for this company, one of which is in Park City, Utah. The other two are of unidentified properties. Also included in the collection are numerous hand drawn mine diagrams, notes, and other administrative materials such as correspondence, reports, and stockholder materials. Further information on this company could not be found.

The Newton's Principia exhibition records (1987-1988) consist of materials relating to an exhibit and lecture series held in February 1988 at the University of Utah in honor of the 300th anniversary of the publication of Isaac Newton's Principia. Included are correspondence, publicity materials, a grant proposal and contract, and display placards used in the exhibit. The complete title of the exhibit was "Newton's 'Principia': Understanding the Gravity of the Situation."

The Nichiren Buddhist Temple records (1954-2003) contain correspondence, financial reports, membership records, the church newsletter, and other documents pertaining to the Nichiren Buddhist Temple. The temple (which dates from 1971-1991) was operated in Salt Lake City by Yosh Ito and Reverend Kanai Skokai. There were more than two hundred members, a large percentage of whom were Japanese Americans.

The William P. Nisbet papers (1893-1942) consists of a journal and a scrapbook which document the life of William Nisbet (1869-1940), a Scottish immigrant to America

The North and East Regional Council of Neighborhood Associations records (1973-1985) consist of documents collected by former chairperson, Barbara Denton, regarding the Association's involvement in policies, projects, and other activities.

The Helen O'Connell papers (1940s-1970s) consist mainly of sheet music used by Helen O'Connell during her singing career. Also included are correspondence, programs, announcements, and clippings. Helen O'Connell was a singer with various bands and individuals such as Jimmy Richards, Larry Funk, Jimmy Dorsey, and Bob Eberly. She also toured with Kay Starr, Rosemary Clooney, and Rose Marie as Four Girls Four.