This issue has variants.
Distributed to newstands in May 1961. This issue includes 10 pages of paid advertisements (pages 2, 9, 15, 19, 25, 27, 33-36 of comic including inside front cover, inside back cover and back cover) ; pages of comic not numbered.
Some information on this issue supplied by Tom Lammers, Dr. Michael J. Vassallo, and others via the Atlas/Timely discussion group. Distribution date from Joseph Marek's Marvel Comics Group history website.
Narrated in the first person. This story is divided into two parts: an untitled part one (6 pp) and part two—"Grogg" (7 pp). Story is pages 3-7, 10-14, 16-18 of comic (pages numbered 1 to 13). Grogg last appeared in issue #83 (April 1961); his next published appearance is in Fantastic Four/Iron Man: Big in Japan (Marvel, 2005 series) #1 (January 2005), while his next chronological appearance is in Marvel Monsters: Monsters on the Prowl (Marvel, 2005 series) #1 (December 2005).
Text story with illustration. Text story is pages 8, 26 of comic (pages of story not numbered).
Story is pages 20-24 of comic (pages of story numbered 1 to 5).
Story is pages 28-32 of comic (pages of story numbered 1 to 5).