Columbia subject headings:
Fortification--Great Britain--History--Bibliography.
Military architecture--Great Britain--History--Bibliography.
Harvard subject headings:
Fortification--Great Britain--History--Bibliography.
Military architecture--Great Britain--History--Bibliography.
Princeton subject headings:
Fortification--Great Britain--History--Bibliography.
Fortification--Ireland--History--Bibliography.
Military architecture--Great Britain--History--Bibliography.
Military architecture--Ireland--History--Bibliography.