Columbia subject headings:
Harvard subject headings:
Somme, 1st Battle of the, France, 1916
World War, 1914-1918--Battlefields--France
World War, 1914-1918--Campaigns--France--Somme.
Princeton subject headings:
Somme, 1st Battle of the, France, 1916.
World War, 1914-1918--Campaigns--France--Somme.