I just received a book today that has the correct ISBN, but it has a different page count and no library in congress info. It's also a different size (smaller) and has a slightly different cover. At first I thought book club edition, but they usually say it, right?

Erin--

Book club editions aren't always easy to identify.  And page counts can differ if the publisher assigns the same ISBN to, say, both a trade and mass market paperback editions of a title, or if the data has been taken from a sketchy source (Amazon is often fairly sketchy for book details).

ARCs often have wording somewhere about being "uncorrected proofs" or "not for sale" or "advanced reader edition".  They may also have, on the back cover, instead of the usual plot blurbs, info more of interest to booksellers, like "20 city author tour", "1 zillion copies first printing", etc.

Feel free to PM me and we can talk about your book -- I'm both a librarian and a former bookseller for Borders, so I've seen a lot of ARCs.

Cheers,

Catt