This is a bookshelf that I built for my home based on a design from This Old House. The bookshelf is 6 pine stair treads, 1 1×4 piece of pine, and a luan board backing. It is held together using pin head screws and box nails. After construction, I stained the piece with Minwax Provincial stain, then coated it with 3 layers of polyurethane.