Reverse angle shot of the same scene as the cover to The Avengers Annual (Marvel, 1967 series) #14. (Noted by Michael Slark via the GCD Error Tracker.)
The story in two parts plus epilog: part one (26 pp.), Part Two "Heart of Darkness" (13 pp.), Epilog (1 p.).
Fred Snyder believed that a different artist penciled pages 32-38 but Nick Caputo sees no signs of anyone other than Byrne.
Text piece by Bob Layton, illustration by Bob Layton, and checklist for Marvel titles of the month.
Total of 8 one-page and 1 two-pages advertisements for Young Astronauts (TV, CBS), Oreo (candy, Nabisco), Bonkers! Robot watch (candy, Nabisco), Reese's Pieces (candy, Hershey), DP Orbaton Barbells and Weight Benches (sports, DP), Comics (back issues, Mile High Comics, 2-pages), Glow-In-The-Dark posters (posters, Pineapple Kids Club), Prizes Or Cash (sales club, Olympic), and Honeycomb (cereal, Post).