Columbia subject headings:
Art, Prehistoric--Yemen (Republic)
Petroglyphs--Yemen (Republic)
Yemen (Republic)--Antiquities.
Harvard subject headings:
Petroglyphs--Yemen (Republic)
Rock paintings--Yemen (Republic)
Yemen (Republic)--Antiquities.
Princeton subject headings:
Art, Prehistoric--Yemen.
Petroglyphs--Yemen.
Yemen--Antiquities.