Columbia subject headings:
Eye--Surgery--Germany--Methodology.
Surgery, Military--Germany--Methodology.
War wounds--Surgery--Germany.
World War, 1914-1918--Surgery--Germany--Methodology.
Harvard subject headings:
Eye--Surgery--Germany--Methods.
Surgery, Military--Germany--Methods.
War wounds--Surgery--Germany--Methods.
World War, 1914-1918--Surgery--Germany--Methods.
Princeton subject headings: