So my book has 2 isbns, one for hard cover and one for library binding. It also has its dust jacket and the isbn on the dust jacket 0060293942 is for the library binding and it says "LIBRARY" beside the bar code on the dust jacket. But  I posted it under the hard cover isbn 0060291397 because the actual book cover is a plain, blank hard cover. And I was thinking that library editions have the illustrated type hard cover. But is that really the case? 

How do you tell if it is a library binding? 

Yikes, that's trixy.  Because I'm notexpert, but my first thought (and second) was the same as yours.  Generally the library edition will have a full color hard cover instead of a dust jacket.  Logically, what else would qualify as library binding?...high quality paper & binding, and durable (non-cloth) cover?

Just for fun, did you try the ISBN over at Amazon?

Check the title page, or the back of that for the publication information and the ISBN.  I'd think the one inside the book would be the "true" ISBN.

I have seen plenty of library bindings, and some come with a dustjacket, but I don't recall ever having seen one that wasn't a picture printed cover--at least all those printed in the last 20 years or so.

Just speculating, but if the book was purchased used somewhere, I'd bet someone took off the dustcover for the library bound edition (since it most likely had a picture printed cover and the DJ was not needed) and put it on a naked version of the same title.

I'd post it as the hardcover edition.  You may include the DJ when posting, but put a Post-It on it with a note saying that the ISBN on the inside of the book should be used when reposting it here.

I decides to post it as a HC and it was on someone's wishlist. As for the origin of the book, it is an ex-library book. That doesn't necessarily mean it is a library binding, though.

Also it has both isbns listed on the back of the title page, one for hc and one for library binding.  I will add a note to the book that I used the HC isbn to post it, so thanks for the suggestion.

Often times all of the published ISBNs are on the title page, some of them clearly not for the book in hand because they are for a paperback when you hold a hardcover, but sometimes not so clearly wrong when they are of similar binding like a library binding and hardcover. I would have posted by the library binding that was in both places myself. But, I think it doesn't make a difference, it sounds like the book can qualify for either definition (many books printed for the library these days are not visibly different than the mass-distributed hardcover. They may just have a bit higher quality paper and binding to stand up to more use).