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Dr. and Mrs. Richard Chace Tolman with their dog
Robert A. Millikan with cosmic-ray equipment
Robert A. Millikan holding 2 C.R. electrometers
Robert A. Millikan at work in his laboratory
Robert A. Millikan with cosmic-ray equipment
Robert A. Millikan holding 2 C.R. electrometers
Guggenheim Board for the Promotion of Aeronautics