Columbia subject headings:
Architecture--Germany--Main River Valley--Guidebooks.
Cities and towns--Germany--Main River Valley--Pictorial works.
Main River Valley (Germany)--Description and travel.
Main River Valley (Germany)--Guidebooks.
Harvard subject headings:
Cities and towns--Germany--Main River Valley--Pictorial works.
Main River Valley (Germany)--Description and travel.
Main River Valley (Germany)--Guidebooks.
Princeton subject headings:
Architecture--Germany--Main River Region--Guidebooks.
Art, German--Germany--Main River Region--Guidebooks.
Art--Germany--Main River Region--Guidebooks.
Main River Region (Germany)--Guidebooks.