Badlands National Monument, South Dakota /

by Swartzlow, Carl Robert, 1901-
Published 1962

Badlands National Monument, South Dakota /

by Swartzlow, Carl Robert, 1901-
Published 1954

Badlands National Monument, South Dakota,

by Swartzlow, Carl Robert, 1901-, Upton, Robert F.
Published 1962

Mount Mazama: explosion versus collapse

by Smith, Warren D (Warren DuPré), 1880-1950
Published 1937

Mount Mazama : explosion versus collapse /

by Smith, Warren D (Warren DuPré), 1880-1950
Published 1937