Columbia subject headings:
Harvard subject headings:
Lead mines and mining--England--Swaledale.
Swaledale (England)--Economic conditions.
Wharton family.
Princeton subject headings:
Lead mines and mining--England--Swaledale (North Yorkshire)--History--Sources.
Swaledale (North Yorkshire)--Economic conditions.
Swaledale (North Yorkshire)--History--Sources.
Wharton family.