Columbia subject headings:
Organ (Musical instrument)--Germany--Frankfurt an der Oder.
Organ (Musical instrument)--Germany.
Organ builders--Germany--Frankfurt an der Oder.
Sauer, Wilhelm, 1831-1916.
Harvard subject headings:
Organ (Musical instrument)--Germany--Frankfurt an der Oder.
Princeton subject headings:
Organ (Musical instrument)--Germany--Frankfurt an der Oder.