Columbia subject headings:
Fortification, Roman--Libya--Tripolitania.
Gheriat el-Garbia (Tripolitania, Libya)
Limes (Roman boundary)--Libya--Tripolitania.
Tripolitania--History.
Harvard subject headings:
Fortification, Roman--Libya--Tripolitania.
Gheriat el-Garbia (Tripolitania, Libya)
Libya--Antiquities, Roman
Limes (Roman boundary)--Libya--Tripolitania.
Tripolitania--History
Princeton subject headings: