This post is a collection of Powerpoints presented in German at the Wien (Austria) Conference in 2017.
Lage der Nation und Exemplar Infos, provided by René Oberweger.
Kommunikation mit Missverständnissen, provided by Lorenz Müller.
Die verschiedenen Arten des Deckchecks, provided by Christian Marx.
Fantastic Fakes and how to find them, provided by Benjamin Geberovich.