Columbia subject headings:
Harvard subject headings:
Demolition, Military--History.
Explosives, Military--History.
Military engineering--Switzerland--History.
Military field engineering--History.
Military topography--Switzerland--History.
Obstacles (Military science)--History.
Switzerland. Armée--History.
Princeton subject headings:
Demolition, Military--History.
Explosives, Military--History.
Military engineering--Switzerland--History.
Military field engineering--History.
Military topography--Switzerland--History.
Obstacles (Military science)--History.
Switzerland. Armée--History.