Columbia subject headings:
Harvard subject headings:
Celtic antiquities.
France--Antiquities, Celtic.
Saint-Riquier (France)--Antiquities, Celtic.
Princeton subject headings:
Celtic antiquities--France--Picardy--Congresses.
Celts--France--Picardy--Congresses.
Celts--Religion--Congresses.
Civilization, Celtic--Congresses.
Excavations (Archaeology)--France--Picardy--Congresses.
Picardy (France)--Antiquities, Celtic--Congresses.