The Simon & Shuster Fireside Fantastic Four book from 1979 is missing from the core - here is the cover.
Added as 'The Fantastic Four HC ', thank you for reporting.
Thank you @CLZ_Rowdy ! I was actually unaware there was a hardcover as I only have the trade paperback. Can you add a TPB entry as well?
The trade paperback has been added.
Thank you @CLZ_Rowdy !