Columbia subject headings:
Church architecture--France--Thiérache--History.
Church architecture--France--Thiérache--Pictorial works.
Fortress-churches--France--Thiérache--History.
Fortress-churches--France--Thiérache--Pictorial works.
Harvard subject headings:
Princeton subject headings:
Church architecture--France--Thiérache--History.
Church architecture--France--Thiérache--Pictorial works.
Fortress-churches--France--Thiérache--History.
Fortress-churches--France--Thiérache--Pictorial works.