Matthias Grünewald | Grunewald | Isaac Grünewald | José Lino Grünewald | Grunewald (Forst) | Grünewald (disambiguation) | Grünewald |
Wippermann claims to have discovered 246 letters from 1891 which discuss in detail swinger-style parties held in a hunting lodge called Jagdschloss Grunewald, west of Berlin.