Columbia subject headings:
City walls--France--Paris--History.
Fortification--France--Paris--History.
Paris (France)--History.
Paris (France)--Pictorial works.
Harvard subject headings:
City walls--France--Paris--History.
Fortification--France--Paris--History.
Paris (France)--History.
Paris (France)--Pictorial works.
Princeton subject headings:
Fortification--France--Paris.
Guidebooks.
Military architecture--France--Paris.
Paris (France)--Description and travel.
Paris (France)--Guidebooks.