Columbia subject headings:
Congo (Brazzaville)--History.
Copper age--Congo (Brazzaville)
Ethnology--Congo (Brazzaville)
Human beings--Migrations.
Harvard subject headings:
Congo (Brazzaville)--History.
Copper age--Congo (Brazzaville)
Ethnology--Congo (Brazzaville)
Human beings--Migrations
Princeton subject headings:
Copper mines and mining--Congo (Democratic Republic).
Migration, Internal--Congo (Democratic Republic).