Columbia subject headings:
City planning--Europe--History--19th century--Congresses.
Germany--Foreign relations--Spain--Congresses.
Spain--Foreign relations--Germany--Congresses.
Harvard subject headings:
Aesthetics, German--19th century--Congresses.
Aesthetics, Spanish--19th century--Congresses.
Architecture, Germanic--Spanish influences--19th century--Congresses.
Architecture, Spanish--German influences--19th century--Congresses.
City planning--Germany--19th century--Congresses.
City planning--Spain--19th century--Congresses.
Cultural relations--19th century--Congresses.
Germany--Civilization--19th century--Congresses.
Germany--Relations--Spain--Congresses.
Spain--Civilization--19th century--Congresses.
Spain--Relations--Germany--Congresses.
Princeton subject headings:
Aesthetics, German--19th century--Congresses.
Aesthetics, Spanish--19th century--Congresses.
Architecture, Germanic--Spanish influences--19th century--Congresses.
Architecture, Spanish--German influences--19th century--Congresses.
City planning--Germany--19th century--Congresses.
City planning--Spain--19th century--Congresses.
Cultural relations--19th century--Congresses.
Germany--Civilization--19th century--Congresses.
Germany--Relations--Spain--19th century--Congresses.
Spain--Civilization--19th century--Congresses.
Spain--Relations--Germany--19th century--Congresses.