Columbia subject headings:
Harvard subject headings:
Architecture--Yemen--Ṣanʻāʾ--Conservation and restoration.
Architecture--Yemen--Ṣanʻāʾ.
Ṣanʻāʼ (Yemen)--Buildings, structures, etc.
Ṣanʻāʼ (Yemen)--History.
Princeton subject headings:
Ṣan'⁻a' (Yemen)--Buildings.
Ṣan'⁻a' (Yemen)--History.