Columbia subject headings:
Harvard subject headings:
German language--Dialectology--Congresses.
German language--Dialects--Congresses
German language--Morphology--Congresses.
German language--Variation--Congresses.
Princeton subject headings:
German language--Dialectology--Congresses.
German language--Dialects--Congresses.
German language--Morphology--Congresses.
German language--Variation--Congresses.