ERBzine 6725b: 4. Pushing the Envelope IVhttps://www.erbzine.com/mag67/6725b.html
was the Dum Dum held in Waterloo, Iowa, that year. The Waterloo, Iowa, Dum Dum: http://www.erbzine.com/mag20/2077.html PUSHING THE ENVELOPE NO. 42 This cover was postmarked May 15
That's everything I could find.
Help make me smarter by submitting a page.