Columbia subject headings:
Rhine River Valley--Description and travel.
Harvard subject headings:
Abbeys--Germany--Rhine River Valley.
Architecture, Medieval--Germany
Architecture, Medieval--Rhine River Valley.
Architecture--Germany--Rhine River Valley.
Castles--Rhine River Valley.
Church architecture--Germany--Rhine River Valley.
Church architecture--Rhine River Valley.
Rhine River Valley--Buildings, structures, etc.
Rhine River Valley--Description and travel.
Princeton subject headings:
Abbeys--Germany--Rhine River Valley.
Architecture--Germany--Rhine River Valley.
Castles--Rhine River Valley.
Church architecture--Germany--Rhine River Valley.
Rhine River Valley--Buildings, structures, etc.
Rhine River Valley--Description and travel.