Hi sorry about that. The link is fixed, though what happened was just an artifact (pun intended) of history. The "list" isn't really a list of artifacts as our text might lead you to believe, but rather just a list of the guidelines for artifacts -- they are scattered about throughout the purple book so we put them into one place.
On top of that, the document in question is one that's already linked in the lesson plan, so you weren't really missing anything, sorry to say.
Anyway, hope that clears it up.