Columbia subject headings:
Fortification--Netherlands.
Maps.
Military engineering--Netherlands.
Nieuwe Hollandse Waterlinie (Netherlands)--History.
Nieuwe Hollandse Waterlinie (Netherlands)--Maps.
Harvard subject headings:
Fortification--Netherlands
Military engineering--Netherlands.
Nieuwe Hollandse Waterlinie (Netherlands)--Atlases.
Nieuwe Hollandse Waterlinie (Netherlands)--History.
Princeton subject headings: