Story continues in Sub-Mariner (Marvel, 1968 Series) #22, then concludes in The Incredible Hulk (Marvel, 1968 Series) #126.
Palmer coloring credit per interview: http://www.wtv-zone.com/silverager/interviews/palmer.shtml
Between pages 12 and 13. Includes a letter from Marc De Matteis and an excerpt of a letter author Tom Wolfe sent to Roy Thomas on his Dr. Strange cameo.