Columbia subject headings:
Organ (Musical instrument)--Construction.
Organ (Musical instrument)--Germany--Westphalia.
Organ builders--Germany--Westphalia.
Harvard subject headings:
Organ (Musical instrument)--Construction--Germany--History.
Organ builders--Germany--History.
Princeton subject headings:
Organ (Musical instrument)--Construction.
Organ (Musical instrument)--Germany (West)--Westphalia.
Organ builders--Germany (West)--Westphalia.