1973. Letter (page 1/2) from Demarco to Arnold Herstand, ref. Twelve Hour Lecture blackboards by Joseph Beuys.
25 September 1973. Copy of typescript letter (page 2 of 2) from Richard Demarco to Arnold Herstand (President of Minneapolis College of Art and Design), with reference to the proposed sale of the Twelve Hour Lecture blackboards created by Joseph Beuys during Edinburgh Arts 1973.