Scans of original art are from the Kirby Museum's Original Art Digital Archive.
Scans of pencil art photocopies for the Kirby Museum's Pencil Art Photocopy Archive courtesy of the Kirby Family, with thanks to TwoMorrows Publishing.
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According Comic Book DB, inkers for this issue are John Tartaglione and John Verpoorten. I suppose that this must be the reason behind there's no inker credit for ths original, isn't it?
The file for this issue which includes the cover is here:
Sorry for the confusion the reason for the lack of credits was that I didn't complete the entry. Added the 2 inkers and letterer.