Columbia subject headings:
Erotica--Germany--History.
Pornography--Germany--History.
Harvard subject headings:
Erotic literature, German--Marketing--History--Congresses.
Erotic literature, German--Publishing--History--Congresses.
Erotica--Europe, German-speaking--History--Congresses.
Pornography--Europe, German-speaking--History--Congresses.
Princeton subject headings: