Columbia subject headings:
Harvard subject headings:
Carthusians--Europe--History.
Carthusians--History--Congresses.
Charterhouses--Europe--History--Congresses.
Elite (Social sciences)--Europe--History--Congresses.
Upper class--Europe--History.
Princeton subject headings:
Carthusians--History--Congresses.
Charterhouses--Europe--History--Congresses.
Elite (Social sciences)--Europe--History--Congresses.