What would you call a big pile of books?

We had an interesting conversation around the Circulation Desk the other day. A huge amount of books had been returned all at once, inspiring the question “What is the collective noun for a bunch of books?” A bevy of books was one suggestion; someone else liked a bounty of books. I said since they were all library books, why not a boomerang of books? They go out, they come back again. An Internet search came up with the term “a library of books”. That was just too obvious and not as fun as creating our own collective nouns. I am not even going to discuss what the website said was the collective noun for librarians. It’s just too stereotypical and really gets my bun in a twist!