Columbia subject headings:
Archives--Germany--Zülpich--Catalogs.
Manuscripts--Germany--Zülpich--Catalogs.
Pfarrarchiv St. Peter zu Zülpich--Catalogs.
Zülpich (Germany)--Church history.
Harvard subject headings:
Pfarrarchiv St. Peter zu Zülpich--Catalogs.
Zülpich (Germany)--Church history--Sources--Bibliography--Catalogs.
Princeton subject headings:
Archives--Germany (West)--Zülpich--Catalogs.
Manuscripts--Germany (West)--Zülpich--Catatlogs.
Pfarrarchiv St. Peter zu Zülpich--Catalogs.
Zülpich (Germany)--Church history--Sources--Bibliography--Catalogs.