Columbia subject headings:
Oldenburg (Germany : Landkreis)--Description and travel.
Oldenburg (Germany : Landkreis)--In literature.
Harvard subject headings:
Oldenburg (Germany : Landkreis)--Description and travel.
Oldenburg (Germany : Landkreis)--In literature.
Princeton subject headings:
Oldenburg (Germany : Landkreis)--Description and travel.
Oldenburg (Germany : Landkreis)--In literature.