Columbia subject headings:
Freight and freightage--Spain--History--18th century.
Freight and freightage--Spain--History--19th century.
Roads--Spain--History--18th century.
Roads--Spain--History--19th century.
Robbery--Spain--History--18th century.
Robbery--Spain--History--19th century.
Transportation--Spain--Passenger traffic--History--18th century.
Transportation--Spain--Passenger traffic--History--19th century.
Harvard subject headings:
Freight and freightage--Spain--History--18th century.
Freight and freightage--Spain--History--19th century.
Roads--Spain--History--18th century.
Roads--Spain--History--19th century.
Robbery--Spain--History--18th century.
Robbery--Spain--History--19th century.
Transportation--Spain--Passenger traffic--History--18th century.
Transportation--Spain--Passenger traffic--History--19th century.
Princeton subject headings:
Freight and freightage--Spain--History--18th century.
Freight and freightage--Spain--History--19th century.
Roads--Spain--History--18th century.
Roads--Spain--History--19th century.
Robbery--Spain--History--18th century.
Robbery--Spain--History--19th century.
Transportation--Spain--Passenger traffic--History--18th century.
Transportation--Spain--Passenger traffic--History--19th century.