Columbia subject headings:
German language--History.
German language--Standardization.
German language--Variation.
German language--Written German.
Regionalism--Germany.
Harvard subject headings:
German language--History.
German language--Standardization.
German language--Variation.
German language--Written German.
Regionalism--Germany
Princeton subject headings:
German language--History.
German language--Standardization.
German language--Variation.
German language--Written German.
Regionalism--Germany.