Columbia subject headings:
Church music--Czech Republic--Congresses.
Organ (Musical instrument)--Construction--Czech Republic--Bohemia--Congresses.
Organ (Musical instrument)--Czech Republic--Bohemia--Congresses.
Harvard subject headings:
Church music--Czechoslovakia--History and criticism--Congresses.
Organ (Musical instrument)--Construction--Czechoslovakia--History--Congresses.
Organ music--Congresses.
Princeton subject headings:
Church music--Czechoslovakia--Congresses.
Organ (Musical instrument)--Construction--Czechoslovakia--History--Congresses.