Columbia subject headings:
German language--Grammar, Comparative--Congresses.
Italian language--Grammar, Comparative--Congresses.
Harvard subject headings:
Contrastive linguistics--Congresses.
German language--Grammar, Comparative--Congresses.
Grammar, Comparative and general--Congresses.
Italian language--Grammar, Comparative--Congresses.
Princeton subject headings:
German language--Grammar, Comparative--Congresses.
Italian language--Grammar, Comparative--Congresses.