Dennis has done what a lot of folks have thought about doing, but never quite gotten around to it - a comprehensive guide to the state of New Mexico (Texas is in there, too, but I haven't climbed there, so can't judge that part). It is a very useful book for those of us who live and climb in NM, but as might be expected of a first effort, is incomplete and inaccurate for many areas. Still, having some information is a lot better than having none, so I recommend buying it. Hopefully Dennis will proceed with a second edition, but I doubt it, because there is a limited market, and it's a huge amount of work.