Columbia subject headings:
Harvard subject headings:
Emergency medical services--History--Congresses.
Medicine, Military--Germany--History--Congresses.
Medicine, Military--Poland--History--Congresses.
War--Medical aspects--Congresses.
World War, 1914-1918--Medical care--Congresses.
World War, 1939-1945--Medical care--Congresses.
Princeton subject headings:
Emergency medical services--History--Congresses.
Medicine, Military--Germany--History--Congresses.
Medicine, Military--Poland--History--Congresses.
War--Medical aspects--Congresses.
World War, 1914-1918--Medical care--Congresses.
World War, 1939-1945--Medical care--Congresses.