Columbia subject headings:
Gaul--Civilization.
Gauls--Social life and customs--Sources.
Gauls--Social life and customs.
Posidonius--Travel--Gaul.
Harvard subject headings:
Gaul--Antiquities.
Posidonius--Travel--Gaul.
Princeton subject headings:
Gaul--Antiquities.
Posidonius--Travel--Gaul.