Marvel Released February 1979

Tarzan #21

Whitman
Low
$2
Mid
$10
High
$30
Published February 1979
Cover Price $0.35

"The Land of the Awful Shadow." In their pyramid city on the dark side of the moon, where they plot to attack the interior of hollow Earth, the Mahars develop a sonic crystal cannon that the Mad Arab covets.  Tarzan is making his way ever closer to Abdul Alhazred, but The Mad Arab has a devilish trick in store for The Ape-Man! Tarzan escapes the ape men and mounts a pterodactyl.