Columbia subject headings:
French language--Grammar, Comparative--German--Congresses.
German language--Grammar, Comparative--French--Congresses.
Grammar, Comparative and general--Prepositions--Congresses.
Harvard subject headings:
French language--Grammar, Comparative--German--Congresses.
German language--Grammar, Comparative--French--Congresses.
Grammar, Comparative and general--Prepositions--Congresses.
Princeton subject headings:
French language--Prepositions--Congresses.
German language--Prepositions--Congresses.
Grammar, Comparative and general--Prepositions--Congresses.
Linguistics--Congresses.