Columbia subject headings:
Drenthe (Netherlands)--History.
Groningen (Netherlands)--History.
Overijssel (Netherlands)--History.
Harvard subject headings:
Drenthe (Netherlands)--History.
Groningen (Netherlands)--History.
Overijssel (Netherlands)--History.
Princeton subject headings:
Drenthe (Netherlands)--History.
Groningen (Netherlands)--History.
Overijssel (Netherlands)--History.