Columbia subject headings:
Artillery, Coast--Nova Scotia--Halifax--History--19th century.
Artillery, Coast--Nova Scotia--Halifax--History--20th century.
Halifax (N.S.)--Defenses.
Harvard subject headings:
Artillery, Coast--Nova Scotia--Halifax--History--19th century.
Artillery, Coast--Nova Scotia--Halifax--History--20th century.
Fortification--Nova Scotia--Halifax.
Princeton subject headings: