Columbia subject headings:
Harvard subject headings:
Dutch language--Vowels.
English language--Vowels
German language--Vowels.
Germanic languages--Phonetics.
Germanic languages--Phonology, Comparative.
Germanic languages--Variation.
Grammar, Comparative and general--Phonology
Linguistic universals.
Typology (Linguistics)
Vowels
Princeton subject headings:
Dutch language--Vowels.
English language--Vowels.
German language--Vowels.
Germanic languages--Phonetics.
Germanic languages--Phonology, Comparative.
Germanic languages--Variation.
Grammar, Comparative and general--Phonology.
Linguistic universals.
Typology (Linguistics)
Vowels.