[Interactive correspondence: postcard (verso) / Sonia Landy Sheridan], c.1970, 1 document textuel (1 feuillet): photocopie sur papier ; 22 X 28 cm. Made by Sonia Landy Sheridan using the copier "Color-in-Color" I and II by 3M. Included in the file entitled "Interactive Correspondence". The Daniel Langlois foundation for Art, Science and Technology, Sonia Landy Sheridan fonds. 0501-1