Columbia subject headings:
Notre-Dame de Valère (Church : Sion, Switzerland)--Organs.
Organ (Musical instrument)--Switzerland--Sion.
Harvard subject headings:
Notre-Dame de Valère (Church : Sion, Switzerland)--Organ.
Organ (Musical instrument)--Switzerland--Sion.
Princeton subject headings:
Organ (Musical instrument)--Switzerland--Sion.