Columbia subject headings:
Earthworks (Archaeology)--England--Monmouth.
Monmouth (Wales)--History.
Harvard subject headings:
Archaeology and history--Wales--Monmouth.
Excavations (Archaeology)--Wales--Monmouth.
Monmouth (Wales)--Antiquities.
Princeton subject headings:
Earthworks (Archaeology)--Wales--Monmouth.
Excavations (Archaeology)--Wales--Monmouth.
Monmouth (Wales)--Antiquities.