Region
Nevada
14
California
11
Massachusetts
5
Alaska
4
Nevada Test Site
3
Afghanistan
2
New Mexico
2
San Bernardino County
2
Santa Clara Valley (Santa Clara County)
2
Santa Cruz Mountains
2
Wisconsin
2
Alaska Peninsula
1
Amargosa Desert (Nev. and Calif.)
1
Antarctica
1
Arizona
1
Ashland Region
1
Asia
1
Beatty Region
1
Bodie
1
Buena Vista
1
California, Southern
1
Central Valley
1
Chesapeake Bay (Md. and Va.)
1
Chesapeake Bay Region (Md. and Va.)
1
Chickasaw National Recreation Area
1
Clark County
1
Colorado
1
Connecticut
1
Culpeper Basin (Va. and Md.)
1
East Asia
1
East Bay
1
Fort Ord
1
Galena
1
Great Basin National Park
1
Hubbard Brook Experimental Forest
1
Hubbard Brook Experimental Forest (N.H.)
1
Ironwood Region
1
Kern County
1
Leadville
1
Lincoln County
1
Litchfield County
1
Long Island Sound (N.Y. and Conn.)
1
Mesquite Lake
1
Michigan
1
Mojave Desert
1
New Hampshire
1
New Haven County
1
New York Bight (N.J. and N.Y.)
1
Noatak National Preserve
1
North Carolina
1
more ...