Columbia subject headings:
Harvard subject headings:
Natisone River Valley (Italy and Slovenia)--Church history.
Natisone River Valley (Italy and Slovenia)--History.
Slavs--Natisone River Valley (Italy and Slovenia)--History.
Slovenes--Natisone River Valley (Italy and Slovenia)--History.
Princeton subject headings:
Natisone River Valley (Italy and Slovenia)--History.
Slavs--Natisone River Valley (Italy and Slovenia)--History.