Columbia subject headings:
Harvard subject headings:
German language--Dialects--Germany--Trier.
Princeton subject headings:
German language--Dialects--Germany--Trier (Regierungsbezirk).
German language--Germany--Trier (Regierungsbezirk)--Standardization.
German language--Social aspects--Germany--Trier (Regierungsbezirk).
Linguistics--Study and teaching--Germany--Trier (Regierungsbezirk).
Sociolinguistics--Germany--Trier (Regierungsbezirk).