Columbia subject headings:
Nuevo León (Mexico : State)--History--19th century.
Nuevo León (Mexico : State)--History--20th century.
Harvard subject headings:
Nuevo León (Mexico : State)--Economic conditions--20th century.
Nuevo León (Mexico : State)--History--20th century.
Princeton subject headings:
Nuevo León (Mexico : State)--Economic conditions--20th century.
Nuevo León (Mexico : State)--History--20th century.