Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Winchester, Dean Eddy (1883-1936) Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) Bowen, Charles F. (1871-1953) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) Mather, Kirtley Fletcher (1888-1978) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) Mather, Kirtley Fletcher (1888-1978) United States of America. Geological Survey.
Wegemann, Carroll Harvey (1879-?) Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) Stany Zjednoczone. Geological Survey
Heald, Kenneth Conrad (1888-1971) Stany Zjednoczone. Geological Survey
Heald, Kenneth Conrad (1888-1971) Stany Zjednoczone. Geological Survey
Heald, Kenneth Conrad (1888-1971) Thom, William Taylor (1891-1979) Stany Zjednoczone. Geological Survey