Region
United States
16
Northeastern States
4
East (U.S.)
2
New Hampshire
2
West Virginia
2
Chicago
1
Fernow Experimental Forest
1
Fernow Experimental Forest (W. Va.)
1
Illinois
1
Maine
1
Nancy Brook Research Natural Area
1
Nancy Brook Research Natural Area (N.H.)
1
North America
1
Pennsylvania
1
White Mountain National Forest (N.H. and Me.)
1