Vulcanism. Dikes-Neck-Caldera. Shiprock, N. M. Crater Lake National Park, Ore.

1966

O'Brien, Emmett J

1:63k

Shiprock

1983

1:24k

Chimney Rock

1936

1:63k

Chimney Rock

1936

1:63k

Chimney Rock

1934

1:63k

Farmington

1980

1:100k

Farmington

1980

1:100k

Chaco

1892

1:250k

Chaco

1892

1:250k

Chaco

1892

1:250k