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(1 - 20 of 97)
Geology Division
Geology Division
Frank Press
Chester Stock
Geology Division
Chester Stock
Robert Sharp
Harrison Brown
Harrison Brown with equipment
Chester Stock
Albert E. J. Engel
Geology Division
Frederick Ransome
Chester Stock
Arthur Gutenberg, Mrs. Hertha Gutenberg, Robert Sharp, Doris and Lee DuBridge
Gerald Wasserburg with vacuum line
Geology Division
Chester Stock
Hugo Benioff
Chester Stock