Bishops files, records of executive and administrative bodies and of diocesan organizations, staff files, parishes and mission's materials, and visual materials and sound recordings.
The records of the diocese of Michigan have been arranged into the following series: Bishops' files, Executive and administrative bodies, Diocesan organizations, Diocesan programs, Diocesan staff, Parishes and missions, Clergy, Audio and visual material, and Miscellaneous.
The record group is most valuable for its documentation of the history of the diocese and the individual churches within its administration, with a lesser amount of material pertaining to religious functions performed and to the operation of diocesan administrative groups and departments. For a number of reasons, there is scant material pertaining to the administration of the diocesan office or to the special programs that have been initiated by it over the years. Some of this material may be found in the papers of individual bishops whose papers have also come to the library and are separately cataloged. These include Samuel McCoskry, Samuel Smith Harris, Charles D. Williams, Herman Page, and Richard Emrich.