The records are divided into 4 series as follows:
- Diocesan Year Books, issued annually & containing details of diocesan administrative structure, activities and contacts, 1863-[ongoing]
- Diocesan Manuals, containing information relating to diocesan procedures and committees. 1945, 1966, 1978
- Diocesan Circulars, issued and received by the Diocesan Office relating to its areas of activity, 1966-1984
- Diocesan Leaflets, issued monthly (until publication ceased in September 1990) for distribution to congregations containing letter from the Archbishop or one of the other bishops and information relating to activities within the diocese, 1928-1990