Columbia subject headings:
Art--Spain--Avila.
Art--Spain--Salamanca.
Art--Spain--Segovia.
Avila (Spain)--Description and travel.
Salamanca (Spain)--Description and travel.
Segovia (Spain)--Description and travel.
Harvard subject headings:
Art--Spain--Avila.
Art--Spain--Salamanca.
Art--Spain--Segovia.
Avila (Spain)--Description and travel.
Salamanca (Spain)--Description and travel.
Segovia (Spain)--Description and travel.
Princeton subject headings:
Art--Spain--Avila.
Art--Spain--Salamanca.
Art--Spain--Segovia.
Avila (Spain)--Description and travel.
Salamanca (Spain)--Description and travel.
Segovia (Spain)--Description and travel.