Columbia subject headings:
Harvard subject headings:
Canals--Switzerland--Design and construction.
Canals--Switzerland--History--20th century.
Inland navigation--Switzerland--History--20th century.
Ships--Switzerland--History--20th century.
Transportation and state--Switzerland--History--20th century.
Waterways--Switzerland--History--20th century.
Princeton subject headings:
Inland navigation--Switzerland--History--20th century.
Ships--Switzerland--History--20th century.
Transportation and state--Switzerland--History--20th century.
Waterways--Switzerland--History--20th century.