Does anyone have any idea about the numbering on these things? Hachette have the full list here: https://hachettepartworks.com/marvels-mightiest-heroes-graphic-novel-collection?sortOrder=&size=200&loading=true
However, I've got three of them - Iron Fist (which should be 38, but is numbered #54), Beast (which should be #42, but is numbered #8) and The Thing (which should be 34, but is numbered 8).
My inclination would be to enter the number that's printed on the book rather than in a list on a web page, albeit an official page.
That's the way I've been doing it, though I've added the info to the notes. It seems there might be some secret distinction between issue number and volume number that may have something to do with the artwork on the spine.