Region
- United States
- Canada 10 results
- Great Britain 6 results
- Middle West 4 results
- Big Bend National Park (Tex.) 2 results
- Bitterroot National Forest (Mont. and Idaho) 2 results
- Black Belt (Ala. and Miss.) 2 results
- California 2 results
- Death Valley National Park (Calif. and Nev.) 2 results
- England 2 results
- Illinois 2 results
- Illinois River 2 results
- Kings Canyon National Park (Calif.) 2 results
- Minnesota 2 results
- New York (State) 2 results
- Northwest Coast of North America 2 results
- Pine County 2 results
- Saratoga Springs 2 results
- Sequoia National Park (Calif.) 2 results
- Southern States 2 results
- Tropics 2 results
- Yellowstone National Park 2 results
- Yosemite National Park (Calif.) 2 results