Place
- Alger6
- Boulder6
- Emmet6
- Idaho6
- New Mexico6
- Baraga5
- South Dakota5
- The Gorge, University of Michigan Biological Station5
- Wisconsin5
- Between Cedarville and Hessel4
- Drummond Island, Maxton Plain4
- Iowa4
- Isle Royale. Tobin Harbor.4
- Larimer4
- North Carolina4
- Oxford4
- Pennington4
- Silver River, 5 miles East of L'Anse4
- Tennessee4
- Arizona3