Columbia subject headings:
Harvard subject headings:
Great Britain. Army--History--World War, 1914-1918--Sources.
Great Britain. Army--Records and correspondence.
Great Britain. Public Record Office--Guidebooks.
World War, 1914-1918--Sources
Princeton subject headings:
Great Britain. Army--History--World War, 1914-1918--Sources.
Great Britain. Army--Records and correspondence.
Great Britain. Public Record Office--Guidebooks.
Guidebooks.
World War, 1914-1918--Sources.