The Ruth Freehafer collection on R.B. Stewart contains Freehafer's drafts of her 1983 book "R.B. Stewart and Purdue University" as well as the notes she compiled while researching Stewart, some of the sources she used, the transcript from a 1977 interview with Stewart, notes from two other interviews with Stewart and his oral history transcript, and notes from interviews conducted with Stewart's colleagues.

Robert J. Gagen engineering tools consist of three sets of engineering drafting/compass tools used by Gagen as a Purdue student. One of the sets has Purdue inscribed on the case.

The collection consists of 41 dance cards, four theater programs and seven Purdue related ephemera and miscellaneous memorabilia from Helen Gould's tenure are a Purdue student, 1922-1926.

The William Chester Halstead photographs document Purdue University, students, faculty, and staff during the 1890s, featuring buildings, student groups, such as the cyclists, drum corps, and artillery. Photographs of note include the burned-out structure of Heavilon Hall and President Smart in his office. The collection also documents the Lafayette area.

The Harrison Hall records contain photographs, slides, and negatives taken during events held at the dormitory. Information regarding the Cavalier Club such as past membership as well as the code and bylaws governing the club can also be found.

The Heating and Power Plant records contain one 1925 article describing the new power plant constructed at Purdue to meet the growing needs of the university.

The Amos Heavilon diary documents one year in the later stages of the life of Amos Heavilon, Clinton county farmer and businessman. This collection includes personal records, photocopies and a typed transcript of the diary. Also included is a typed, biographical sketch of Mr. Heavilon and his family. Insight into the living conditions of the 1890's is revealed and illustrates that not all were as successful and fortunate as Mr. Heavilon.

The Heavilon Hall records contain invitations to the building's original dedication in 1892. Also included are a document describing restoration efforts after a damaging fire; a pamphlet soliciting donations for a clock and chimes for the restored building's tower; a program for the restored building's 1895 dedication; and the blueprints of the planned renovations.

Includes Williams' personnel file, biographical information, and posthumously awarded Title IX Distinguished Service Award

This collection consists of a scrapbook of photographs taken by David Moses, documenting the construction of the Hicks Undergraduate Library and the unveiling of the Purdue Mall fountain.

The Horticulture Building records contain the program from the building's dedication in 1926 and associated booklet "Indiana Horticulture: A Story of Horticultural Progress Prepared in Connection with the Dedication of the Horticultural Building, Purdue University." The booklet provides a brief history of horticulture in Indiana and lists the programs offered in the building at the time.

Collections consists of statistical reports, historical brochure, general information pamphlet, newsletters, a 1930 group photograph, and 1941-42 listing of international students at Purdue University.

Research materials, recorded interviews, and correspondence related to the writing and publication of First Man, the authorized biography of Neil Armstrong by James R. Hansen.

The Knoy Hall of Technology records contain information about the construction of the building and a floorplan.

The Lambert Field House and Gymnasium records contain open house information pamphlets from the building's dedication ceremony.

The Lawson Computer Science Building records contains an information booklet about the building and its donors and two blank greeting cards featuring an illustration of the building on the front.