Columbia subject headings:
Harvard subject headings:
Germanic languages--Declension.
Germanic languages--Morphology.
Germanic languages--Noun.
Proto-Germanic language--Declension.
Proto-Germanic language--Grammar.
Proto-Germanic language--Inflection.
Proto-Germanic language--Morphology.
Proto-Germanic language--Suffixes and prefixes.
Proto-Germanic language--Word formation.
Princeton subject headings:
Proto-Germanic language--Declension.
Proto-Germanic language--Grammar.
Proto-Germanic language--Inflection.
Proto-Germanic language--Morphology.
Proto-Germanic language--Suffixes and prefixes.
Proto-Germanic language--Word formation.