The Earl H. Hornbarger Collection consists of materials relating to his time as a member of the Corps class of 1921 and his later career with Westinghouse Electric Company.

A large majority of the collection relates to Hornbarger's time as a student from 1917 to 1921. It contains a "VPI Memory Book" scrapbook, several banquet brochures and dance cards. There are several artifacts from this time as well, including a pocket bible and a VPI class pin. There is a fold-out pictorial of the entire VPI Corps of Cadets class from 1919-1920, Barracks 1-4. The collection also contains several pamphlets and articles pertaining to Hornbarger's Class of 1921 Reunion in 1962.

Several magazine and book publications pertain to Hornbarger's engineering career with the Westinghouse Electric Company, including a Westinghouse Instruction book written by Hornbarger, a edition of Westinghouse Magazine, and several photos related to Westinghouse production projects.