Freunde + Freunde Friends + Fruend. Karl Gerstner, Diter Rot, Daniel Spoerri, André Thomkins und Freunde.
Stuttg., Hansjörg Mayer, 1969, without pagination, num. ills., printed on paper of various diff. colours, bound as a blockbook, orig. wr. Locher, H. and Broos, K. (introd.). Publications by Edition Hansjörg Mayer. The Hague, Gemeentemus., 1968, without pagination, num. ills., bound as a blockbook, orig. wr.
- Yellowed; first few lvs. loose. = Text in Dutch, German and English.
Für Augen und Ohren. Von der Spieluhr zum akustischen Environment. Objekte, Installationen, Performances. Berlin, Akademie der Künste, 1980, 312p., ills., orig. wr., square 8vo. - AND a publisher's catalogue by Edition Hansjörg Mayer (1979) and 2 copies of a sm. exhibition cat. on the same.