Columbia subject headings:
Harvard subject headings:
Ahr River Valley (Germany)--History.
Ahrgau (Germany)--Church history.
Ahrgau (Germany)--History.
Aristocracy (Social class)--Germany--Ahrgau--Biography.
Convents--Germany--Ahrgau--History.
Monasteries--Germany--Ahrgau--History.
Monasticism and religious orders--Germany--Ahrgau--History.
Nobility--Germany--Ahrgau--Biography.
Princeton subject headings:
Ahr River Valley (Germany)--History.
Ahrgau (Germany)--Church history.
Ahrgau (Germany)--History.
Aristocracy (Social class)--Germany--Ahrgau--Biography.
Convents--Germany--Ahrgau--History.
Monasteries--Germany--Ahrgau--History.
Monasticism and religious orders--Germany--Ahrgau--History.
Nobility--Germany--Ahrgau--Biography.