More precise, but less effective, because some of the URLs found in the first search are IP numbers rather than domain name. Oh well, useful information anyway, and your method turned up this.
Yellowstone More Volcanically Active than Previously Estimated
Space Daily ^ | 07/19/2002 | Brooke Shiley
Posted on 07/26/2002 11:14:29 AM PDT by cogitator
http://freerepublic.com/focus/news/722866/posts?page=32#32
You might also be interested in the new scholar.google.com, which indexes articles in scholarly journals. For example, searching for Marvin Herndon on scholar.google.com turns up 11 results, some of which are publicly available.