This series contains books, articles, and reports written by Wellman and other scientists in his field. Common themes in these publications include Fusarium and coffee rust (Hemileia vastatrix). The series is divided into three sections: Writings, United Fruit Company Reports, and Collected Works.

Writings are arranged chronologically, ranging from 1922 to 1981. Although Wellman is most well known for his coffee research, his early publications include topics such as celery, tomatoes, and timber. His earliest paper in this collection is entitled Wellman wrote this paper as a student at the University of Wisconsin. Other early works include a journal article, co-authored by J. C. Walker, and an abstract of Wellman's thesis, Other works include reprints from the , , and

Also included are two reviews of Wellman's works, one of , and the other of .

When necessary, correspondence is attached to a report in order to put the letter and the report in proper context.

United Fruit Company Reports consist of 14 reports originally kept confidential by the United Fruit Company in Tela, Honduras. These reports are arranged chronologically, and range from 1915 to 1930. The earliest report is a draft of a report about Panama banana disease, written by Professor Prescott. Other reports are written by Horace A. Dean, Wellman, T. J. Grant, and M. M. Manns. The subject of the reports consists mostly of bananas, the United Fruit Company's main crop.

Collected Works are arranged alphabetically. This collection includes works such as Eddie Echandi's , a collection of the , and Joseph A. Tosi's .

Items in this series include lectures, outlines, and drawings used by Wellman for teaching purposes. Included are Wellman's mycology notebook (in Spanish), plant disease lectures given by Wellman in 1962 and minutes of the 18 December 1957 Graduate Council at the Inter-American Institute of Agricultural Sciences in Turrialba, Costa Rica.

Materials from North Carolina State University include a 1964 written examination from Phytopathology II, notes and lectures from the two-year Neotropical Phytopathology seminar series, and 1969 notes from PP 608, History of Plant Pathology.

The final folder in this series deals with public relations. Included are several ideas to make the public more aware of plant pathology, including notes for the television series and a series of memos about famine.

This series contains information regarding various aspects of Wellman's research. The series is divided into three parts: Proposals, Coffee Research, and Other Research. All materials are arranged chronologically.

Proposals span from 1944 to 1962. Included is correspondence and reports regarding Wellman's research ideas, including a 1946 letter to Dr. Nathaniel E. Winters proposing studies on market diseases in plants in El Salvador. Wellman has drawn an arrow to Winters's name and written Turned it down. Other proposals include book publications, classification of causal organisms and effects in tropical American plant diseases, and Wellman's plans for field service consultant.

Wellman's coffee research mainly revolves around coffee rust disease (Hemileia vastatrix). Included is correspondence regarding the rust. Early coffee rust correspondence portrays tactics to prevent the rust from spreading to the western hemisphere. Later correspondence details the rust's effects after it hit the Latin American coffee crop. Also included are coffee rust reports, including the reports from the World Coffee Mission in 1951 and 1952, copies of the , ponencias de la asamblea, newspaper stories, and coffee rust alerts.

Other research includes drawings, charts, and notes about other topics, mainly Fusarium. Wellman drew many of the sketches on the backs of United States Department of Agriculture letterhead.

This series consists of programs, articles, and correspondence regarding awards and conferences. Items in this series are arranged chronologically.

The earliest item is a 1953 memo from Wellman to Claud L. Horn consisting of a review of the Coffee Round-Table meeting in San Jose, Costa Rica. The latest item is a schedule from the 1980 Symposium on Rust Diseases held in Minneapolis, Minnesota. Here Wellman and North Carolina State University colleague Eddie Echandi spoke about the status of coffee rust in Latin America.

The most abundant information is about the Caribbean Division of the American Phytopathological Society, especially regarding Wellman's 1971 Award of Merit, the 1972 conference in Mexico City, and the division's 1972 honoring of eight scientists for their contributions to tropical plant pathology.

The eight scientists honored by the Caribbean Division of the A.P.S. are Agesilau A. Bitancourt, Alvaro Santos Costa, Don Edwin Ellis, Jose A. B. Nolla, Antonio Lopes Branquinho d'Oliveira, William C. Snyder, John A. Stevenson, and George A. Zentmyer. Wellman asked each man to send a copy of their cirriculum vita, which are included with the correspondence.

This series contains items of interest that do not fit in with other items in this collection. Some of these items relate to Wellman's profession, while others are remnants from his personal life. Included are four pamphlets advertising the DuBay products Ceresan and Semesan, a postcard and Christmas card from Portugal, a caricature of Wellman, two bulletins from the University of Denver School of Art, and a historiography of the Wellman family, including the Wellman coat of arms.

This series consists of materials related to Wellman's professional life, although not necessarily research-oriented. The materials range from 1918 to 1969, and are arranged chronologically.

Although some of the correspondence in this series concerns Wellman's research, most of it details Wellman's job prospects and his termination from the Instituto Interamericano de Ciencias Agrícolas due to limited funding. Other information included in this series consists of notifications of pay raises, employment applications, civil service efficiency ratings, appointments from the Regents of the University of Wisconsin, and curriculum vitae and publication lists. Certificates from the Washington Academy of Sciences, the United States Civil Service Commission, and the United States Department of Agriculture are also included.

This series includes notes and outlines from Wellman's various manuscript projects. A good portion of the material stems from Wellman's book . Also included are illustrations from . Wellman also left citation information about his publications.

The photographs in this collection depict research and scenery from the tropics. Boxes 11-13 contain scientific photgraphs, some of which were used in Wellman's books. Box 14 contains United States Department of Agriculture (USDA) Foreign Agricultural Relations Photos from Ecuador, El Salvador, and Guatemala. Many of the photographs have descriptions on the back, describing such scenes as virus disease symptoms and different types of trees. Some of the pictures, however, contain little or no description. Some of the photographs have been converted into postcards, which are located in Box 15. Slides and an advertisement for Sandoz is also located in this box. Box 17 contains photographs that are larger than 8" x 10". Most of these photographs are USDA Foreign Agricultural Relations Photos from El Salvador.