Columbia subject headings:
Buitrago (Madrid, Spain)--Buildings, structures, etc.
City walls--Conservation and restoration--Spain--Buitrago (Madrid)
Fortification--Conservation and restoration--Spain--Buitrago (Madrid)
Harvard subject headings:
Princeton subject headings:
Buitrago (Madrid, Spain)--Buildings, structures, etc.
City walls--Conservation and restoration--Spain--Buitrago (Madrid).
Fortification--Conservation and restoration--Spain--Buitrago (Madrid).