Columbia subject headings:
Marshals--Great Britain--Correspondence.
Robertson, W. R. (William Robert), 1860-1933--Correspondence.
World War, 1914-1918--Great Britain.
Harvard subject headings:
Marshals--Great Britain--Correspondence.
Robertson, W. R. (William Robert), 1860-1933--Correspondence.
Robertson, William Robert, Sir, 1860-1933--Correspondence.
World War, 1914-1918--Great Britain
Princeton subject headings:
Great Britain. Army--Officers--Correspondence.
Robertson, William Robert, Sir, 1860-1933.
World War, 1914-1918.