There are some archives in the AAJ that you can access online. Just look up the American Alpine Journal website and type in Cloud Peak and it will give you some different things in the range. Some are very interesting especially the stuff around Cloud Peak. You may have to really search through the info to find what you're looking for. There is even some first accounts of explorers coming through in the 30s that are really interesting. I too have shared some of the mixed routes in the Cirque with Noback, that is some amazing country.