Going against the current, aren't you ?
Do you have stacks of #98's to flip ?
First thought that popped in my head.
Ween is in the Preview-or-ad-is-a-first-appearance crowd. So unless you think anything in print qualifies as a first appearance over an appearance in an actual story, take anything he says with a grain of salt.
Note that I'm not saying that ads, previews, sketchbooks, etc. don't have relevance to the collector (I pick up decent copies of Marvel Age 82 when I see them for cheap), but it's just not as important IMO as an appearance in creative content.