Columbia subject headings:
Boundaries--History.
Europe--Boundaries--History.
Languages in contact--Europe.
Harvard subject headings:
Boundaries--History.
Europe--Boundaries--History.
Languages in contact--Europe.
Schneider, Reinhard, 1934-
Princeton subject headings:
Boundaries--History.
Europe--Boundaries--History.
Languages in contact--Europe.
Schneider, Reinhard, 1934-