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) Stany Zjednoczone. Geological Survey
Heald, Kenneth Conrad (1888-1971) Thom, William Taylor (1891-1979) Stany Zjednoczone. Geological Survey
Winchester, Dean Eddy (1883-1936) 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