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I'm planning on building a bookcase out of oak. The overall deminisions will be 71" tall and 54" wide. The shelves will be made out of 3/4" plywood and be approximatly 52" long. They will be loaded with nursing books. I'm planning on using a small piece of oak wood rabbitted and gluedto the shelf probably an inch and a quarter on the front and back of the shelves for strength. My question is can I span this far without the shelves sagging and if so will the inch and a quarter be enough?