Columbia subject headings:
Architecture--Spain--Madrid.
Hydraulic engineering--Spain--Madrid (Region)--History.
Public works--Spain--Madrid (Region)--History.
Harvard subject headings:
Architecture, Modern--17th-18th centuries--Spain--Madrid (Region)
Architecture--Spain--Madrid (Province)--History.
Architecture--Spain--Madrid (Region)--History.
Charles III, King of Spain, 1716-1788.
Public works--Spain--Madrid (Province)--History.
Public works--Spain--Madrid (Region)--History.
Princeton subject headings: