Notebooks - a confession

So, I saw a photo online of someone's notebook collection, and I thought I'd take my own photo. (I should admit, for the sake of full disclosure, that this isn't all of them: I actually have a couple of drawers filled with used notebooks, or half-used ones, I just couldn't be bothered to go find them all...)

What's the collective noun for notebooks? An insanity?

Quite a lot of notebooks