Columbia subject headings:
Harvard subject headings:
Mineral industries--Switzerland--Müstair Valley--History.
Mineral industries--Switzerland--Schweizerischer Nationalpark--History.
Ore-dressing--Switzerland--Müstair Valley--History.
Ore-dressing--Switzerland--Schweizerischer Nationalpark--History.
Princeton subject headings:
Mineral industries--Switzerland--Müstair Valley--History.
Mineral industries--Switzerland--Schweizerischer Nationalpark--History.
Ore-dressing--Switzerland--Müstair Valley--History.
Ore-dressing--Switzerland--Schweizerischer Nationalpark--History.