Pencils were tentatively credited to Sal Buscema; changed to John Buscema with Joe Sinnott inks based on info from Nick Caputo (August 2008).
Englehart's credit is from http://www.steveenglehart.com/Comics/First%20Marvel%20Scripts%20I.html.
Pencil credit changed from Jack Abel, based on Sekowsky pencil credit / Abel ink credit on back of original art of final page, per Mike at Heritage Auctions. Correction submitted through the GCD Errors List (July 2009). Sekowsky credit does not appear in the comic; art is credited to Abel alone.