Columbia subject headings:
Architectural drawing--Germany--Cologne.
Church architecture--Germany--Cologne.
Facades--Germany--Cologne.
Kölner Dom.
Harvard subject headings:
Architectural drawing--Germany--Cologne.
Church architecture--Germany--Cologne.
Facades--Germany--Cologne.
Kölner Dom.
Princeton subject headings:
Architectural drawing--Germany--Cologne.
Church architecture--Germany--Cologne.
Facades--Germany--Cologne.
Kölner Dom.