Columbia subject headings:
Harvard subject headings:
Austria--Guidebooks.
Germany--Guidebooks.
Historic sites--Austria--Guidebooks.
Historic sites--Germany--Guidebooks.
Princeton subject headings:
Austria--History--1789-1900.
Austria--History--20th century.
Germany--History--1789-1900.
Germany--History--20th century.
Historic sites--Austria.
Historic sites--Germany.
Monuments--Austria.
Monuments--Germany.