Columbia subject headings:
German language--Influence on Slavic languages--Congresses.
Languages in contact--Congresses.
Slavic languages--Germany--Foreign elements--Congresses.
Harvard subject headings:
German language--Influence on Slavic--Congresses.
Languages in contact.
Slavic languages--Grammar--Congresses.
Princeton subject headings:
German language--Influence on Slavic--Congresses.
Languages in contact.
Slavic languages--Grammar--Congresses.