Columbia subject headings:
Harvard subject headings:
Aisne, Battle of the, France, 1918.
Chemin des dames (France)--History--20th century.
Germany. Heer--History--World War, 1914-1918.
World War, 1914-1918--Campaigns--France--Aisne.
World War, 1914-1918--Campaigns--France--Chemin des dames.
World War, 1914-1918--Campaigns--Western Front
Princeton subject headings:
Germany. Heer--History--World War, 1914-1918.
World War, 1914-1918--Campaigns--Western Front.