This collection consists of letters, newspaper clippings, legal documents related to Roy C. Vandercook and his various careers. Most significant in the collection is the bulk of correspondence concerning the Michigan National Guard and the 1913 copper strike. Vandercook was responsible for the majority of military action and exchanged a great deal of letters with Governor Woodbridge Ferris.

Included are also letters discussing various phases of the U.S. occupation of the Philippines. Military correspondence referring to the security measures taken in Michigan during World War I to protect vital industry and transportation is included. And, in this same general time period, is information regarding wheat production and possession and federal action.

Other subjects included are the Michigan State Police, Ferris Institute, the Michigan Constabulary, the Michigan Railroads Association and Vandercook's activities as its legislative agent.