Schaller, Waldemar Theodore (1882-1967) United States of America. Geological Survey.
Schaller, Waldemar Theodore (1882-1967) United States of America. Geological Survey.
Schaller, Waldemar Theodore (1882-1967) United States of America. Geological Survey.
Schaller, Waldemar Theodore (1882-1967) Henderson, Edward Porter (1898- ) United States of America. Geological Survey.