Prev Next Category: Letter Invitation from Rainbow 1979-10-09 Cece Rainbow, USA Section: Mail Art Network Sent from: Catonsville, MD, USA Medium: Printed matter Category: Letter, Invitation Dimensions (cm): 9.7 x 11.7 Pages: 2 Notes: "1979 Color Postal Art Exhibit" Subject: rainbow, mail art, 1979 color postal art exhibit, color grouping, color, medium