The Julius T. Willard papers include records related to his tenure at Kansas State University, personal records, the Students' Army Training Corps, financial documents, statistics related to the university, literary works, and various reports and printed materials. The correspondence series, 1894–1926, includes letters from the chief of the United States Department of Agriculture, the Riley County Treasurer, Kansas Attorney General Aretas Allen Gotard, professors at other universities, and many others. Correspondence also includes letters from the Agricultural Experiment Stations throughout Kansas, the United States, and Cuba, as well as correspondence related to reports of the Agricultural Experiment Stations. Subjects in the correspondence series relate to Willard’s travels abroad, personal purchases, character references, normal schools, articles by Willard submitted to Farm Life, subscriptions to various publications, chemistry coursework, etc. Correspondence relates both to Willard’s work at Kansas State College (KSC) as well as personal matters.

The subject file series includes both K-State and personal files. The K-State subject files are extensive, including academic calendars, applications for employment, correspondence about the selection of the official K-State college color, and information about various campus departments. The subject files also include information about various campus organizations, as well as biographical information about various faculty members, including Nellie Kedzie Jones and Mary Van Zile. Personal subject files contain financial documents pertaining to the Tacoma Company and the Portland Cement Company, as well as various organizations with which Willard was a member.

Materials in the estate series include correspondence related to the Willard farm and estate, expenditures, and receipts. The literary works series contains history of KSC in newspapers and in letters, drafts of works, and autobiographical reminiscences. The history of KSC in newspapers includes copies of articles printed in newspapers connected to K-State. The history of KSC in letters contains letters and newspaper correspondence pertaining to acts by the Board of Regents from 1897 to 1899. Additionally, there is a chapter omitted from Willard’s 1940 book, History of Kansas State College of Agriculture and Applied Science, titled “Discussion of the Controversy of the Seventies" [1870s]. The literary works series includes drafts of his 1940 book and Willard’s autobiographical reminiscences.

The military file series includes business files related to the Students' Army Training Corps and the Reserve Officers’ Training Corps, as well as materials connected to training camp at Fort Sheridan. The bulk of the materials dates from 1918 and 1919. The financial documents series of Willard’s papers contains receipts, vouchers, and other materials related to K-State expenses including laboratory charges. The statistics series contains materials related to grade distribution, attendance, and enrollment. The report series includes reports for American Universities and Colleges, the Department of the Interior Bureau of Education, the North Central Association of Colleges and Secondary Schools, as well as other reports such as the cost of attending K-State.

The final series includes a variety of printed materials including invitations, programs, a speech class syllabus, articles, and quotations. Also included are card files with lecture notes, names and positions of numerous faculty and students, and notes on various pieces of history related to K-State.