Columbia subject headings:
Artisans--Germany--North Rhine-Westphalia.
Housing--Germany--North Rhine-Westphalia.
Harvard subject headings:
Artisans--Germany--North Rhine-Westphalia.
Housing--Germany--North Rhine-Westphalia.
Princeton subject headings:
Artisans--Germany--North Rhine-Westphalia.
Housing--Germany--North Rhine-Westphalia.