Columbia subject headings:
Catholic Church. Diocese of Liège (Belgium)--History--Sources.
Catholic Church. Diocese of Utrecht--History--Sources.
Tongres (Belgium : Diocese)--History--Sources.
Harvard subject headings:
Catholic Church. Archdiocese of Utrecht--History--Sources.
Liège (Belgium : Archdiocese)--History--Sources.
Tongres (Belgium : Diocese)--History--Sources.
Princeton subject headings: