Columbia subject headings:
Harvard subject headings:
America--Discovery and exploration--Norse.
Canada--Antiquities.
Greenland--Antiquities
Labrador (N.L.)--Antiquities.
Northmen--Greenland
Northmen--Newfoundland and Labrador.
Northmen--Newfoundland--Labrador.
Princeton subject headings:
America--Discovery and exploration--Norse.
Greenland--Antiquities.
Northmen--Greenland.
Vikings.