Prev Next Category: Invitation Plus and Minus - Two Environments 1980-11-05 R E Buff, Canada Section: Mail Art Network Sent from: Petersborough, Canada Medium: Printed matter Category: Invitation, Printed matter Dimensions (cm): 29.7 x 21 Pages: 2 Subject: r e buff, mackenzie gallery, plus and minus – two environments, a science-fiction buff – an illustrated lecture