Receipt from Aaron Burr to Alexander Hamilton, 5 March 1789.

Abel Wolman was an American inventor, scientist, professor and pioneer of modern sanitary engineering. The papers trace Abel Wolman's active career as teacher, consulting engineer and advisor to local, national, and international agencies and include correspondence, documents, and files documenting his various activities from 1901-1989.

Acheson J. Duncan was born September 24, 1904 in Leonia, New Jersey and was an authority in the fields of industrial statistics and quality control. The collection consists largely of research papers that describe his concentration in the fields of bulk sampling, industrial statistics, and quality control. The collection spans the years 1936 to 1985.

A.D. Emmart was a journalist at The Baltimore Sun newspaper in Baltimore, Maryland from 1924 to 1972. Included in the collection is a scrapbook containing his editorial writings from 1927 to 1934, book reviews and art criticisms from 1928 to 1960, and many articles from his assignments in Russia from 1928 to 1933, and London in the 1940s.

From 1983 until 1990, Agendas International, was a private public affairs company registered with the U.S. Department of Treasury and paid by the Government of Nicaragua. The items in the collection document press involvement in the investigation of the Iran-Contra Affair from 1983 to 1989.

Albert L. Genter was a chemical engineer working in Baltimore, MD during the 1930s. The collection consists of one laboratory diary kept by Albert L. Genter, 1932-1933, while he was formulating a process for sludge conditioning at the Back River Sewage Disposal Plant in Baltimore, MD.

Collection consists of a series of lectures presented by Professor Albert Lanphier Hammond at Hopkins during the spring semester, 1961. The subject of Hammond's lectures was the Theory of Knowledge. The lectures have been transcribed from tape and are available in the typescript. The original tape is included in the collection, but two of the twelve lectures are not available in typescript.

Aleine Austin was historian and author born in New York City, July 19, 1922. The papers, dating from 1940 to 1991, consist of student notes, lecture notes, published articles, manuscript notes, recordings, photographs, correspondence, and a selection of papers that document Aleine Austin's interest and work in the American labor movement.

Alexander Rourke Butler (1920-1985) was professor of humanities at Michigan State University. The collection contains student notes from Butler's graduate work in history at Johns Hopkins, notes for his lectures at the University of Helsinki, and items related to the Butler Prize. The materials range in date from 1947 to 1982.

Allen Weir Freeman was a physician and Johns Hopkins University of Public Health Administration born in 1881, and was brother of the author, Douglas Southall Freeman. Collection consists of letters to and from Freeman family members (dating 1904 - 1907) while Allen Weir Freeman was a medical student and during the start of his career.

The collection spans the years 1900-1938 and is formed by items with some references to theatrical and artistic events of the period.

Arthur W. Tyler was born March 14, 1842 in Pittsfield, Illinois. This collection spans the years 1861-1896 and consists of subject files and correspondence. The majority of the records in the collection deal with Tyler's career as a librarian.

Aurel Friedrich Wintner (8 April 1903 – 15 January 1958) was a mathematician noted for his research in mathematical analysis, number theory, differential equations and probability theory. The collection consists largely of Wintner's writings and reprints of his colleagues' work with materials spanning 1848 to 1961.

The collection consists of an unbound scrapbook containing 17 pages of newspaper clippings from The Baltimore Gazette and The Baltimore Republican, dating from August 28, 1835 to October 15, 1835. They give an account of the trial of the Bank of Maryland against Thomas Ellicott.

Professional and political papers of Democratic Senator Barbara A. Mikulski, who served on the Baltimore City Council (1971-1976), in the U. S. House of Representatives for Maryland’s 3rd Congressional District (1977-1987), in the U. S. Senate for Maryland (1987-2017), and as a Homewood Professor of Public Policy at Johns Hopkins University.

Benjamin G. Kohl (1938-2010) was an author and historian who specialized in the history of the Renaissance. The collection consists of research material and personal papers ranging in date from 1960-2006, including a series of correspondence between Kohl and his mentor, Frederic Chapin Lane.

Benjamin Silliman and Benjamin Silliman, Jr. were both 19th century American chemists and original members of the National Academy of Sciences. The collection spans the years 1816-1871 and consists of 28 autograph letters from both Benjamin Silliman and Benjamin Silliman, Jr., and one eulogy of Benjamin Silliman.

Bernard Christian Steiner a graduate student at Johns Hopkins University. The collection consists of three notebooks from courses Steiner attended at Hopkins in 1888-1890. The material covered includes lectures by Daniel Coit Gilman on charities, Elgin Ralston Lovell Gould on the family, and Woodrow Wilson on the administration of the state.

Blanche D. Coll (1916-2003) was an author and historian whose main area of research was the history of social welfare in the United States. Collection ranges in dates spanning 1908, the 1930s, and 1969 and consists of 26 photographs; two published volumes of Mary E. Richmond, a founder of modern social work; Coll's thesis; an oral history transcript; and four audio tapes.