Columbia subject headings:
Public libraries--Germany--Hohenzollern--History--Sources.
Public libraries--Germany--Württemberg--History--Sources.
Harvard subject headings:
Archives--Germany--Baden-Württemberg--Catalogs.
Public libraries--Germany--Hohenzollern--History--Sources--Bibliography--Catalogs.
Public libraries--Germany--Württemberg--History--Sources--Bibliography--Catalogs.
Princeton subject headings: