Sort of an oblique non-answer: We've been switching to e-books. Haven't replicated the whole library yet, and won't do that with some anyway, but new acquisitions and all our systems documentation
, etc.) are becoming electronified.
I did still need some overflow area for physical books
. Used a milk crate as the "book case" (located on a shelf) and a bungee or two as the fiddles. Wallah.