Western States

Archives West descriptions of primary sources in the western United States, including correspondence, diaries or photographs with some digital reproductions
Mountain West Digital Library portal to digital resources from musuems, archives, colleges, universities and historical societies in Hawaii, Idaho, Nevada and Utah. Materials include photos, maps, art, videos, pioneer diaries, books, vital records and finding aids.

Also see individual Western States:

Alaska
California
Idaho
Montana
Oregon
Utah
Washington
Wyoming