An extensive holding of archival materials can be found in Special Collections at Utah State University. Some materials are also held at Boise State University.
Information can be obtained at Archives West: http://archiveswest.orbiscascade.org/. Type in “Western Literature Association” and click on the archive you’d like to explore.
If you have questions regarding the holdings of the Utah State University repository, please contact Clint Pumphrey, Archivist, Special Collections.