Eric Andersen
Extensive lot of documentation, 'Opus' works and letters sent to Willem de Ridder, with correspondence about several projects (such as the unrealized Fluxus Yearbook). Contains 12 cards/letters and 7 Opus sheets, mostly around 1965.
+ Documentation and works sent by Andersen to Tjeerd Deelstra in the early 70s including an original cardboard collage featuring Opus 47 & 56 plus a b/w picture of the artist taped on verso. Includes c. 20 pp. Opus related texts, five envelopes from Martha Salonen (Andersen's art information centre) containing correspondence, a chain letter and a set of 24 postcards printed with one single letter. (total c. 45)