William Gamewell Pierce
University College Cork
Irving Jerome Witkind
United States Geological Survey
Jewell J. Kirby
Clyde Polhemus Ross
Denver Federal Center
L.B. Bumgardner
H.D. Curry
Dolan H. Eargle
University of California, San Francisco
Marianne Zeyringer
University of Oslo
M. M. Knechtel
Gustavo Calero Díaz
Universidad de Granada
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