Columbia subject headings:
Germany. Heer--History--World War, 1914-1918.
Germany. Heer--Infantry--Drill and tactics.
World War, 1914-1918--Campaigns.
Harvard subject headings:
Germany. Heer--History--World War, 1914-1918.
Germany. Heer--Infantry--Drill and tactics.
World War, 1914-1918--Campaigns
Princeton subject headings:
Germany. Heer--History--World War, 1914-1918.
World War, 1914-1918--Campaigns.