After reading another post here of somebody shooting through a telephone book, I thought I'd do something useful with one of my old (softcover) college textbooks...
This is a much heavier book than a phone book, and I was shooting with a 48# at 31" (I pull 30.5") longbow shooting about 700 grain arrows. The Wensel Woodsmans are 125-grain glue ons, over inserts, so tips are 175 grains overall.
I backed up and shot it at 40 yards, and ended up hitting close to the spine of the book. And look what happened!
This week I am planning on getting my broadheads sharp for hunting season anyway, but now I have extra motivation for taking off those needle points.