The Calumet Mining and Refining Company records (1927-1980s) contain information about several mining plants throughout Utah and Nevada. It also has information about mined materials and mining methods. Many of the materials also pertain to the Combined Metals Reduction Company.

The Camp Williams collection (1915-1942) contains correspondence, maps, and financial documents related to the founding of Camp Williams.

The George Gordon Campbell papers (1899-1957) contain correspondence, diaries, genealogy, an article and various notes pertaining to the Church of Jesus Christ of Latter-day Saints (LDS Church).

The Robert L. Campbell papers (1840-1873) contain his diaries, correspondence, genealogy, and broadsides. Robert L Campbell (1825-1874) was an early Mormon educator, and one of the pioneers who crossed the Overland Trail in 1854. He was the Territorial Superintendant of Schools, and is widely held responsible for the birth of the school system in Utah.

The Ray R. Canning family papers (1892-2004) are a collection of correspondence, pictures, personal emphemera, and reminiscences gathered by Ray and his wife Lois Cook Canning.

The Hugh J. Cannon missionary correspondence (1926-1928) contain correspondence pertaining to the LDS Church's Swiss and German Mission, where Hugh Jenne Cannon (1870-1931) presided as mission president from 1925 to 1928. The correspondence reports the progress of missionary T. Quentin Cannon; some are addressed to him and some are to his parents, Jesse F. and Margaret Cannon.

The M. Hamlin Cannon papers (1951-1977) consist of copies of articles and correspondence, mainly regarding history of the Church of Jesus Christ of Latter-day Saints. M. Hamlin Cannon (1909-1978) was a military and LDS Church historian.

The Paul B. Cannon papers (1852-1989) contain correspondence, a scrapbook, articles, and news clippings. Cannon was an attorney in Salt Lake City, Utah.

The Capitol Hill collection (1980-1991) contains information about the designation of Capitol Hill as a historical district. The records include correspondence between the Capitol Hill Community Council, residents and the city council. Also included are newsclippings, public hearing notices, and reports.

The Capitol Hill Community Council records (1989-1990) consists of documents pertaining to projects involving this organization.

The Capitol Reef National Park records (1880-1999) consist of photocopies of material collected by Park Service employees at Capitol Reef National Park, and include correspondence, reports, articles, news clippings, notes, maps, biographies, and autobiographies relating to the establishment of Capitol Reef National Park and the development of the surrounding landscape.

The Carbon County coal strike records (1906-1973) contain original documents and photocopies of transcripts, petitions, correspondence, newsletters, flyers, court records, and articles concerning the Carbon County Coal Strike of 1933.

The Fredrick A. Carleson papers (1883-1993) contain correspondence, diaries, scrapbooks, certificates, notebooks, pamphlets, and business records concerning Fredrick Carleson and members of the Carleson, Gailey, and Patterson families. Carleson owned an automobile dealership in Salt Lake City. He was president of the Utah Automobile Dealers Asociation during the 1970s.

The Carl Arvid Carlquist correspondence (1892-1893) consists of three letters, one from Carlquist to Utah Governor Caleb W. West, and two from West to Carlquist. Carlquist (1857-1938) was an immigrant from Sweden to Utah, a missionary to Sweden for the LDS Church, and a Utah businessman who was active in politics.

The Thomas R. Carlson papers (1909-1997) consists of correspondence, notebooks, reports, essays, and articles written or collected by Thomas Carlson on topics in mining engineering. Carlson is a mining engineer who spent most of his career working in various capacities for the Kennecott Copper Corp.

The Frank Cyrus Carman papers (1924-1989) consist of correspondence, broadcast transcripts, financial and business records, and QSL (radio transmission) cards documenting Frank Cyrus Carman's career in radio broadcasting. Carman established and managed several early Utah commercial radio stations, including KUTA (later KLUB) and KISN in Salt Lake City. The bulk of the collection consists of records, including advertising and public affairs broadcast transcripts, from these stations.

The Joseph H. Carpenter correspondence (1887-1896) is between Joseph H. Carpenter in Utah and his family in England, including sentiments for and against the LDS Church. Carpenter was the son of a Congregational Church of England minister who moved to Utah and converted to the LDS Church.

The Albert Carrington papers (1847-1887) contain diaries, correspondence, and other documents that recount Carrington's life and dealings with his family, mission, the Church of Jesus Christ of Latter-day Saints (LDS Church), business, school, politics, and other aspects of his life.

This collection contains correspondence (1875-1902) from depositors addressed to the Carson City Savings Bank located in Carson City, Nevada.