Columbia subject headings:
Stairs--Mediterranean Region.
Stereotomy--Mediterranean Region.
Stone buildings--Mediterranean Region.
Harvard subject headings:
Ragusa (Italy)--Buildings, structures, etc.
Stairs--Mediterranean Region.
Stereotomy.
Stone buildings--Mediterranean Region.
Princeton subject headings:
Ragusa (Italy)--Buildings, structures, etc.
Stairs--Mediterranean Region.
Stereotomy.
Stone buildings--Mediterranean Region.