Columbia subject headings:
Architects--Spain.
Architectural drawing--Spain--18th century.
Architecture--Spain--History--17th century.
Harvard subject headings:
Architects--Spain.
Architectural drawing--18th century--Spain.
Architecture, Modern--17th-18th centuries--Spain.
Princeton subject headings:
Architects--Spain.
Architectural drawing--18th century--Spain.
Architecture--Spain--18th century.