Columbia subject headings:
Harvard subject headings:
Communication and culture--Rhine River Valley--Congresses.
Intercultural communication--Rhine River Valley--Congresses.
Mass media and culture--Rhine River Valley--Congresses.
Rhine River Valley--Boundaries--Congresses.
Rhine River Valley--Relations--Congresses.
Princeton subject headings:
Communication and culture--Rhine River Valley--Congresses.
Intercultural communication--Rhine River Valley--Congresses.
Mass media and culture--Rhine River Valley--Congresses.
Rhine River Valley--Boundaries--Congresses.
Rhine River Valley--Relations--Congresses.