Columbia subject headings:
Harvard subject headings:
Arbors--Design and construction.
Arbors--History.
Arbors.
Pergolas--Design and construction.
Pergolas--History.
Pergolas.
Trellises--Design and construction.
Trellises--History.
Trellises.
Princeton subject headings:
Arbors--Design and construction.
Arbors.
Pergolas--Design and construction.
Pergolas.
Trellises--Design and construction.
Trellises.