Columbia subject headings:
Harvard subject headings:
Organ (Musical instrument)--Construction--Germany--Bochum.
Organ (Musical instrument)--Germany--Bochum..
Organ (Musical instrument)--Germany--History.
Orgelbau Johannes Klais (Firm)
Ruhr-Universität Bochum--Organ.
Ruhr-Universität Bochum--Organs.
Princeton subject headings:
Organ (Musical instrument)--Construction--Germany--Bochum.
Organ (Musical instrument)--Germany--History.
Orgelbau Johannes Klais (Firm)
Ruhr-Universität Bochum--Organs.