Columbia subject headings:
Langen family.
Nobility--Germany--Telgte--History--Sources.
Telgte (Germany)--History--Sources.
Harvard subject headings:
Langen family.
Nobility--Germany--Telgte--History--Sources.
Telgte (Germany)--History--Sources.
Princeton subject headings:
Germany--Genealogy.
Langen family--Archives.
Telgte (Germany)--History--Sources.