Columbia subject headings:
Bridles--History.
Europe, Central--Antiquities.
Harnesses--History.
Harvard subject headings:
Europe--Antiquities, Roman.
Germany--Antiquities, Roman.
Horses--Europe--Equipment and supplies.
Horses--Germany--Equipment and supplies.
Princeton subject headings:
Europe, Western--Antiquities, Roman.
Germany--Antiquities, Roman.
Horses--Europe, Western--Equipment and supplies.
Horses--Germany--Equipment and supplies.