Columbia subject headings:
Harvard subject headings:
Artists' preparatory studies--Italy--Catalogs.
Drawing, Italian--Catalogs.
Drawing--Spain--San Lorenzo del Escorial--Catalogs.
Escorial--Catalogs.
Princeton subject headings:
Artists' preparatory studies.
Catalogs.
Drawing, Italian--Catalogs.
Drawing--16th century--Spain--San Lorenzo del Escorial.
Philip II, King of Spain, 1527-1598--Art patronage.