Literature:
Dirk Dobke. Dieter Roth,
Bücher und Editionen, Catalogue Raisonné.
London, Edition Hansjörg Mayer, 2004.
Page 93, illustration in color of a different copy.

Annotation:
From 14th February until 7th August 1981 Dieter Roth played 74 times on his harmonica. He recorded his music on audio cassettes and these moments were documented on Polaroid. The cassettes were edited by William Furlong, London, in an edition of 5.