Columbia subject headings:
Inscriptions--Saudi Arabia--ʻUlā.
Petroglyphs--Saudi Arabia--ʻUlā.
ʻUlā (Saudi Arabia)--Description and travel.
ʻUlā (Saudi Arabia)--Geography.
Harvard subject headings:
Inscriptions--Saudi Arabia--ʻUlā.
Petroglyphs--Saudi Arabia--ʻUlā.
ʻUlā (Saudi Arabia)--Description and travel.
ʻUlā (Saudi Arabia)--Geography.
Princeton subject headings: