- 26 associated American Indian tribes
- Approximately 1,600 archeological sites
- More than 300 ethnographic resources (animals, plants, sites)
- More than 24 sites, landmarks, and districts on the National Register of Historic Places
- 1 National Historic Trail
- More than 900 historic buildings
- More than 379,000 cultural objects and natural science specimens
- Thousands of books (many rare), manuscripts, periodicals
- About 90,000 photographic prints and negatives
