They get their LIT's from Lightning Source and it's possible that some publishers aren't using Lightning Source as a distributor anymore. Over Drive seems to be the distributor of choice for a lot of pubs and OD dropped FW a while back. eReader is their format so they obviously carry that and Mobipocket is distributed directly from Mobi (as well as OD). AFAIK OD is the only one distributing epub too. Also some pubs seem to be dropping some formats. Also I've noticed sometimes lit gets added later on some books so maybe the distro isn't getting the info out to FW on time.
If you can find it in lit at Books On Board chances are it's distributed through OD. If ebooks.com has it that's because they are there own distributor.
This is all just guesses based on observation of course. I have no inside knowledge.
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