Columbia subject headings:
Biological weapons--History--To 1500.
Chemical weapons--History--To 1500.
Military art and science--History--To 500.
Harvard subject headings:
Biological weapons--History--To 1500.
Chemical weapons--History--To 1500.
Military art and science--History--To 500
Princeton subject headings:
Biological weapons--History--To 1500.
Chemical weapons--History--To 1500.
Military art and science--History--To 500.