Columbia subject headings:
Howells, William Dean, 1837-1920.
Italy--Relations--United States.
United States--Relations--Italy.
Harvard subject headings:
Howells, William Dean, 1837-1920.
Italy--Relations--United States.
United States--Relations--Italy.
Princeton subject headings:
Howells, William Dean, 1837-1920.
Italy--Relations--United States.
United States--Relations--Italy.