Columbia subject headings:
Aristocracy (Social class)--England--Yorkshire--To 1500.
Aristocracy (Social class)--Iceland--History--To 1500.
Widows--England--Yorkshire--History--To 1500.
Widows--Iceland--History--To 1500.
Harvard subject headings:
Aristocracy (Social class)--England--Yorkshire--History--To 1500
Aristocracy (Social class)--England--Yorkshire--To 1500.
Aristocracy (Social class)--Iceland--History--To 1500.
Widows--England--Yorkshire--History--To 1500.
Widows--Iceland--History--To 1500.
Princeton subject headings:
Aristocracy (Social class)--England--Yorkshire--To 1500.
Aristocracy (Social class)--Iceland--History--To 1500.
Widows--England--Yorkshire--History--To 1500.
Widows--Iceland--History--To 1500.