Columbia subject headings:
Jürgen Ahrend Orgelbau.
Organ (Musical instrument)--Germany.
Organ builders--Germany--History.
Harvard subject headings:
Ahrend, Jürgen
Jürgen Ahrend Orgelbau--History.
Organ (Musical instrument)--Construction--History.
Organ (Musical instrument)--Germany--History.
Organ builders--Germany--History.
Princeton subject headings: