The Charles C. Plitt Collection consists of a series of journals resulting from weekly botany field trips, which Plitt referred to as "tramps," ranging in date from about 1898 to 1922. Plitt led these tramps through many areas around Baltimore, such as Loch Raven, Glen Burnie, Towson, Curtis Bay, and Ellicott City. The collection also includes biographical data, correspondence, photographs, and a book.

The John Peter Richardson Correspondence with W. S. Reynolds contains two letters between Richardson and Reynolds relating to the status of agriculture in South Carolina and the possibility of a survey of agriculture, soils, and mineral resources.

The William McLeod Rivera Papers consist of journals, papers both written and collected by Rivera, conference publications, correspondence, and information on courses taught by Rivera.