Columbia subject headings:
Harvard subject headings:
German language--Orthography and spelling--Competitions--Congresses.
German language--Study and teaching--Congresses.
German language--Vocabulary--Congresses.
Spelling ability--Competitions--Congresses.
Princeton subject headings:
German language--Orthography and spelling--Competitions--Congresses.
German language--Study and teaching--Congresses.
German language--Vocabulary--Congresses.
Spelling ability--Competitions--Congresses.