Columbia subject headings:
Grammar, Comparative and general--Auxiliaries--Congresses.
Grammar, Comparative and general--Verb--Congresses.
Historical linguistics--Congresses.
Harvard subject headings:
Grammar, Comparative and general--Auxiliaries--Congresses.
Grammar, Comparative and general--Verb--Congresses.
Historical linguistics--Congresses.
Princeton subject headings:
Grammar, Comparative and general--Auxiliaries--Congresses.
Grammar, Comparative and general--Verb--Congresses.
Historical linguistics--Congresses.