Columbia subject headings:
Advertising, Newspaper--Germany--North Rhine-Westphalia--Case studies.
Harvard subject headings:
Advertising, Newspaper--Germany--North Rhine-Westphalia--Case studies.
Princeton subject headings:
Advertising laws--Germany--North Rhine-Westphalia--History.
Advertising--Germany--North Rhine-Westphalia--History.
Press law--Germany--North Rhine-Westphalia--History.