Region
California
1
Colorado
1
Crater Lake National Park
1
Crater Lake National Park (Or.)
1
Craters of the Moon National Monument
1
Craters of the Moon National Monument (Idaho)
1
Craters of the Moon National Preserve
1
Craters of the Moon National Preserve (Idaho)
1
Idaho
1
Lassen Volcanic National Park
1
Lassen Volcanic National Park (Calif.)
1
Lava Beds National Monument
1
Lava Beds National Monument (Calif.)
1
Oregon
1