Columbia subject headings:
Harvard subject headings:
Alps, Swiss (Switzerland)--History.
Graubünden (Switzerland)--Boundaries.
Mountain passes--Switzerland--Alps, Swiss--History.
Septimer Pass (Switzerland)--History.
Princeton subject headings:
Mountain passes--Switzerland--History--To 1500.
Septimer Pass (Switzerland)--History--To 1500.
Transportation--Switzerland--History--To 1500.