Columbia subject headings:
Architecture, Domestic--France--Picardy.
Country homes--France--Picardy.
Historic buildings--France--Picardy.
Picardy (France)--History.
Harvard subject headings:
Castles--France--Picardy--Pictorial works.
Manors--France--Picardy--Pictorial works.
Nobility--France--Picardy--History.
Picardy (France)--Description and travel.
Princeton subject headings:
Architecture, Domestic--France--Picardy.
Country homes--France--Picardy.
Historic buildings--France--Picardy.
Picardy (France)--History.