Columbia subject headings:
Merchants--Spain--Santander--History--18th century.
Merchants--Spain--Santander--History--19th century.
Middle class--Spain--Santander--History--18th century.
Middle class--Spain--Santander--History--19th century.
Santander (Spain)--Commerce--History.
Harvard subject headings:
Merchants--Spain--Santander--History.
Middle class--Spain--Santander--History.
Santander (Spain)--Commerce--History.
Santander (Spain)--Economic conditions.
Santander (Spain)--Social conditions.
Princeton subject headings:
Merchants--Spain--Santander--History.
Middle class--Spain--Santander--History.
Santander (Spain)--Commerce--History.
Santander (Spain)--Economic conditions.
Santander (Spain)--Social conditions.