My question was badly phrased. I'm not that surprised that there are books/documents produced by NATO. I'm surprised they sell them. I think everything (public)

My question was badly phrased. I'm not that surprised that there are books/documents produced by NATO. I'm surprised they sell them. I think everything (public) produced by NATO should be freely accessible to everyone. This was so obvious to me that I'm surprised it's not the case, another little reminder of the world we live in.