Broadus Mitchell was an educator, historian, and biographer of Alexander Hamilton. Mitchell taught economics at Hopkins, 1919-1939, and was active in political affairs and issues of social justice in Baltimore. The collection consists of some papers related to Broadus Mitchell's research for his published work, William Gregg, Factory Master of the Old South, (1928) and Mitchell's biographical materials. The papers span from 1928 to 1929 and 1979-1986.

Charles Grove Haines was a Professor of Diplomatic History born in Abbottstown, Pennsylvania December 10, 1906. The bulk of the collection consists of correspondence and subject files dating to Haines's time as the Director of the Bologna Center at the School of Advanced International Studies dating from 1970-1976. Some personal items are also included.

C. Harvey Palmer, Jr. is professor emeritus of electrical engineering at Johns Hopkins University, specializing in optics. This collection holds selections of Palmer's research notes and teaching files, loose leaf and in binders, ranging from 1968 to 1990.

The collection consists of photographs of Calcutta, India in the early 1940s, a printed map of Calcutta and Howrah, twelve prints of scenes in India, and one informational clipping about Calcutta removed from the Christian Science Monitor (March 1, 1974).

Collection consists of ten holographic letters that exhibit the routine daily business of early American economists, Mathew Carey, Hezekiah Niles, and Tench Coxe. Carey's letters (1803-1827) address publication problems; Niles' letters (1821-1833) include comments on slavery, the tariff and an overdue bill; Coxe's letters (1796-1808) are concerned with his public duties in the Treasury Department.

C. Alphonso Smith (1864 – 1924) was an American Professor of English, college dean, philologist, and folklorist. The collection consists largely of clippings from newspapers and periodical regarding the English language and the introduction of slang words used by the military, ranging from 1905-1923.

Charles Howard Carter was born in Baker, Oregon on April 3, 1927. He was Professor of History at Tulane University and a noted specialist on Spanish and European diplomacy in the sixteenth and early seventeenth centuries.

Charles Mason Remey was an architect, author, and a religious leader of the Baha'i faith. He was born in Burlington, Iowa, May 15, 1874. The collection consists of 154 bound volumes, spanning 1836-1940. In the volumes are personal reminiscences, clippings, photographs, memorabilia, biographical accounts of Mason and Remey family members, and a historical record of the Baha'i faith.

Charles McCurdy "Mac" Mathias Jr. (1922-2010) was a Republican member of the United States Senate, representing Maryland from 1969 to 1987. He was also a member of the Maryland House of Delegates and the United States House of Representatives. The collection includes material from Mathias's service in both the House of Representatives and the Senate dating from approximately 1958-1988.

Charles Rockwell Lanman, born July 8, 1850 was a philologist in the late nineteenth and early twentienth centuries. The collection consists of lectures delivered by Lanman while at Johns Hopkins University from 1876 to 1880.

Collection consists of one bound holographic notebook of philosopher and mathematician, Charles S. Peirce. The notebook contains a catalog of books on logic and scholastic philosophy from Peice's personal library. Peirce also noted the estimated value of each title. Most likely, Peirce compiled the notebook, 1880-1881, at a time when he hoped to find a buyer for his library. Most of the books were acquired by the Johns Hopkins University in 1881.

Charles Southward Singleton (1909-1985) was professor of Hispanic and Italian studies at The Johns Hopkins University. Collection is largely research notes dealing with Singleton's later work with some correspondence, family photographs, and awards.

This collection consists of letters and papers of Charles William Emil Miller, professor of Greek at The Johns Hopkins University.

A collection of newspaper clippings dealing with the events of the first year of the Civil War, 1861.

Clarence Edward Keefer, a sanitary engineer, was born in Baltimore in 1891, and received his B.E. from Johns Hopkins in 1919. From 1940 to 1945, Keefer was an instructor in sanitary engineering at JHU. He published an important work in his field in 1940. Collection consists manuscript pages of chapters from Keefer's "Sewage-Treatment Works: Administration and Operation" dating from 1935 to 1940.

The collection consists of correspondence, manuscript notes, reports, meteorological observations, reprints, drawings, and lecture notes of astronomer and meteorologist, Cleveland Abbe, dating from 1851 to 1952.

A collection of almost 260 letters and documents dating 1861-1864, written by various officers of the Confederate States Government and the Confederate Navy.

The collection consists of one bound holographic ledger (1787-1801) containing copies of petitions from citizens who hoped to purchase lots and estates in Maryland formerly held by persons loyal to the British crown during the period of the American Revolution.

Conrad Potter Aiken (1889–1973) was an American writer, whose work includes poetry, short stories, novels, a play, and an autobiography. The collection consists of one letter from Conrad Aiken to an unidentified correspondent, January 26, 1969.

Conrad Aiken (1889–1973) was an American poet, novelist, and critic. Collection consists of one published poem (1968) titled "A Clear, Brave, Civilizing Force" and was Aiken's contribution to the committee of Arts and Letters for Humphrey.