On-sale date from the Direct Currents page of From Beyond the Unknown (DC, 1969 series) #8 and copyright registration.
Art credits from letters page.
Letters of comment from: Penita S. Trucker, Martin Berkenwald. Excerpts of letters from: Delores Beluch, Quentin Murdock, Albert Hess, Mark Jewell, Tim Smith, Rudy Bernhard, David Toub, D. Greenman, Brad Bauer, Jeff MCullers, Gerard Triano. Notes that this issue's cover was drawn by Curt Swan and Dick Giordano.