Marshall, Robert Bradford (1867-1949) Stany Zjednoczone. Geological Survey
Pardee, Joseph Thomas (1871-1960) Stany Zjednoczone. Geological Survey
Pardee, Joseph Thomas (1871-1960) Stany Zjednoczone. Geological Survey
Pardee, Joseph Thomas (1871-1960) Stany Zjednoczone. Geological Survey
Lupton, Charles Thomas (1878-1935) United States of America. Geological Survey.