Spatial Coverage
- Overland Trails2
- Rocky Mountains Region2
- South America2
- Alaska1
- Canada.1
- Canadian River1
- Canadian Rockies (B.C. and Alta.)1
- Columbia River Watershed1
- Columbia River Watershed.1
- Dakota Territory1
- France1
- Great Basin1
- Idaho1
- Mexican-American Border Region1
- Mexico, North1
- Mexico.1
- Missouri River Watershed1
- Nevada1
- New Mexico1
- North Dakota1
