Columbia subject headings:
Grammar, Comparative and general--Syntax.
Grammar, Comparative and general--Verb.
Kru language--Syntax.
Kru language--Verb.
Harvard subject headings:
Grammar, Comparative and general--Syntax.
Grammar, Comparative and general--Verb.
Kru language--Grammar, Comparative.
Kwa languages--Grammar, Comparative.
Princeton subject headings:
Grammar, Comparative and general--Syntax.
Grammar, Comparative and general--Verb.
Kru language--Syntax.
Kru language--Verb.