Columbia subject headings:
Harvard subject headings:
Military art and science--History--19th century--Congresses.
Military art and science--History--20th century--Congresses.
Military engineering--History--19th century--Congresses.
Military engineering--History--20th century--Congresses.
Military history, Modern--19th century--Congresses.
Military history, Modern--20th century--Congresses
Princeton subject headings:
Military art and science--History--Congresses.
Military history--Congresses.
Technology--Congresses.