Columbia subject headings:
Buildings, Octagonal--Italy--Puglia.
Castello del Monte (Italy)
Castles--Italy--Puglia.
Geometrical drawing.
Harvard subject headings:
Buildings, Octagonal--Italy--Puglia.
Castello del Monte (Italy)
Castles--Italy--Puglia.
Geometrical drawing.
Princeton subject headings:
Architecture, Romanesque--Italy--Apulia.
Buildings, Octagonal.
Castello del Monte (Italy)
Castles--Italy--Apulia.
Geometrical drawing.
Structural drawing.