Columbia subject headings:
Italy--Foreign relations--United States.
Marsh, George P. (George Perkins), 1801-1882.
United States--Foreign relations--Italy.
Harvard subject headings:
Italy--Foreign relations--United States.
Marsh, George Perkins, 1801-1882.
United States--Foreign relations--Italy.
Princeton subject headings:
Italy--Foreign relations--United States.
Marsh, George P. (George Perkins), 1801-1882.
United States--Foreign relations--Italy.