Columbia subject headings:
Harvard subject headings:
Command and control systems--Germany.
Germany--History, Military--20th century.
Germany. Heer--History--World War, 1914-1918.
Germany. Heer--Officers--Biography.
World War, 1914-1918--Germany.
World War, 1914-1918--Regimental histories--Germany
Princeton subject headings:
Germany. Heer--History--World War, 1914-1918.