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I don't think it's the id. We have a lot of books that have internally linked items, for which each has an id, and they don't open up in pop-up. It's not the superscript, as near as I can tell. I concur, they have a crapload of material to sample. It's not the metadata, either. (See: I know what it ISN'T, but damn if I know what it IS.)
I suspect some type of quasi-interrogatory parsing. That's my best bet.
Hitch
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