Columbia subject headings:
Farmhouses--Spain--Maestrazgo--Guidebooks.
Fortification--Spain--Maestrazgo--Guidebooks.
Towers--Spain--Maestrazgo--Guidebooks.
Harvard subject headings:
Princeton subject headings:
Farmhouses--Spain--Maestrazgo--Guidebooks.
Fortification--Spain--Maestrazgo--Guidebooks.
Guidebooks.
Towers--Spain--Maestrazgo--Guidebooks.