Columbia subject headings:
Belgium--Antiquities.
Bone implements--Belgium.
Paleolithic period--Belgium.
Stone implements--Belgium.
Harvard subject headings:
Belgium--Antiquities.
Caves--Belgium
Excavations (Archaeology)--Belgium.
Paleolithic period--Belgium.
Princeton subject headings:
Belgium--Antiquities.
Excavations (Archaeology)--Belgium.
Paleolithic period--Belgium.