Mandarin figure drawn by John Romita. The original, unaltered cover can be seen on Marvel Super-Heroes #61. Info per Nick Caputo, August 2012.
According to Herb Trimpe in his introduction to Marvel Masterworks Incredible Hulk volume 4, Marie Severin provided layouts for him. Marie also redrew the Hulk's face in several panels. Info per Nick Caputo.
Letters from Randy Rasmussen, Jack Hogston, Shirley Gorman, Denis Druash, Gerald Cleaver, and Mark Gawson & Mark Barclay; includes Know Ye These, the Hallowed Ranks of Marveldom.