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Dr. and Mrs. Richard Chace Tolman with their dog
Robert A. Millikan with cosmic-ray equipment
C. C. Lauritsen and Bennett with high volts transformers
Robert A. Millikan holding 2 C.R. electrometers
Robert A. Millikan at work in his laboratory
Robert A. Millikan looking through microscope
Robert A. Millikan with cosmic-ray equipment
Robert A. Millikan holding 2 C.R. electrometers
Charles C. Lauritsen and R. D. Bennett in high volts lab
Guggenheim Board for the Promotion of Aeronautics
J. Robert Oppenheimer