Horan's collection consists of postcards and photographs. His postcard collection contains both baseball and football players, scenes, and buildings of Michigan State University. Of note, are the postcards of the fraternity and society houses and two postcards that depict the burning Engineering Building. Horan's photographs consist of interior and exterior shots of the Olympic House as well as one photograph of five uniformed soldiers.

Horan's collection consists of postcards and photographs. His postcard collection contains both baseball and football players, scenes, and buildings of Michigan State University. Of note, are the postcards of the fraternity and society houses and two postcards that depict the burning Engineering Building. Horan's photographs consist of interior and exterior shots of the Olympic House as well as one photograph of five uniformed soldiers.