[Signed copy] Mülheimer Freiheit
Nieuwe Duitse Kunst 1: Mülheimer Freiheit. H. P. Adamski, Peter Bommels, Walter Dahn, Georg Jiri Dokoupil, Gerard Kever, Gerhard Naschberger. Groninger Museum, 1981. 52 p. Signed by all 6 artists.
Nieuwe Duitse Kunst 1: Mulheimer Freiheit.