Region
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Portage Lake Volcanics (Mich.)
1
Rocky Mountains
2
Saint Croix National Scenic Riverway (Wis. and Minn.)
1
Saint John
1
Sleeping Bear Dunes National Lakeshore
1
Sleeping Bear Dunes National Lakeshore (Mich.)
1
South Dakota
1
Teton Range (Wyo. and Idaho)
1
Texas
1
United States
16
United States Virgin Islands
1
Utah
1
Washington (D.C.)
1
Washington (State)
2
West Virginia
2
White Pine County
1
White Sands National Monument
1
White Sands National Park (N.M.)
1
Wind Cave National Park (S.D.)
1
Wrangell-Saint Elias National Park and Preserve
1
Wrangell-Saint Elias National Park and Preserve (Alaska)
1
Wyoming
3
Yellowstone National Park
3