Columbia subject headings:
Harvard subject headings:
Architecture--Germany--Eifel--Guidebooks.
Art--Germany--Eifel--Guidebooks.
Eifel (Germany)--Guidebooks.
Princeton subject headings:
Architecture--Germany (West)--Eifel--Guidebooks.
Art, German--Germany (West)--Eifel--Guidebooks.
Eifel (Germany)--Guidebooks.