That is certainly a lot of quilting books !! I'm glad I don't have that many. A few days ago my shelving unit (the kind with the metal brackets and the supports that snap into them) ripped off the wall in my sewing room. Most of my quilting books and magazines were on the 3rd shelf, then I had all sorts of sewing stuff in little 4 drawer storage containers, hundreds of buttons in one drawer, stuff in plastic shoe boxes, patterns, etc. It all toppled off as the shelves came down, knocked my iron off the board, some stuff landed on "Maggie May" (my FW). I just wanted to cry. Took me all day to pick up everything and put it in the correct container. I've been wanting to make or get a tall book shelf, I knew I should have done so sooner. Well, now it's getting done. Just had to vent...So be careful with heavy stuff on shelves.