Columbia subject headings:
Rhine River Valley--History--Congresses.
Rhine River Valley--In art--Congresses.
Rhine River Valley--In literature--Congresses.
Rhine River--Symbolic aspects--Congresses.
Harvard subject headings:
Rhine River Valley--History
Rhine River Valley--In art.
Rhine River Valley--In literature.
Princeton subject headings:
Rhine River Valley--History.
Rhine River Valley--In art.
Rhine River Valley--In literature.