Columbia subject headings:
Harvard subject headings:
Somme (France)--Tours.
Somme, 1st Battle of the, France, 1916
Somme, 2nd Battle of the, France, 1918.
World War, 1914-1918--Battlefields--France--Guidebooks.
Princeton subject headings:
Guidebooks.
Somme (France)--Tours.
Somme, 1st Battle of the, France, 1916.
Somme, 2nd Battle of the, France, 1918.
World War, 1914-1918--Battlefields--France--Guidebooks.