Columbia subject headings:
Harvard subject headings:
Celtic languages--Grammar--Congresses.
Celtic languages--Syntax--Congresses.
Reference (Linguistics)--Congresses.
Welsh language--Middle Welsh, 1100-1400--Grammar--Congresses.
Princeton subject headings:
Celtic languages--Grammar--Congresses.
Celtic languages--Syntax--Congresses.
Reference (Linguistics)--Congresses.
Welsh language--Middle Welsh, 1100-1400--Grammar--Congresses.