Rather than jamming books together with the binding facing out, face book covers outward. Place them in separate bins organized by topic. You should also label each book according to difficulty level. This way students can find books that they are interested in as well as getting books at the appropriate reading level. Those circular yellow, blue, red and green stickers work well for this. Make one for each reading level: emergent, early, transitional, and fluent. You can level within these 4 levels using numbers. When you meet with individual students, you can talk about the level in which they belong so they will know what books to choose.