This issue has variants.
Central Thor image identified as by John Romita Sr. from Mark Elstob on January 16, 2005 error report.
Background scenes by Kirby/Klein taken from interior panels, per Nick Caputo, January 2011.
The origin of Galactus concludes, first appearance of the World of Taa.
George Klein's final work before his untimely death in September, 1969.