Columbia subject headings:
Harvard subject headings:
Grammar, Comparative and general--Congresses.
Language and languages--Grammars--Congresses.
Otomanguean languages--Grammar--Congresses.
Otomanguean languages--Inflection--Congresses.
Tone (Phonetics)--Congresses.
Princeton subject headings:
Grammar, Comparative and general.
Language and languages--Grammars.