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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
Sid Epley
Herbert Ingham
Mike O’Haver
Ray Labory
Robert Oaks
Bob Lehman
Robert A. Millikan at work in his laboratory
Les Scott
Ray Labory
Al Cramer
Robert A. Millikan with cosmic-ray equipment
Robert A. Millikan holding 2 C.R. electrometers
Henry Gunning and Ted Combs
Ted Combs and Henry Gunning
Henry Gunning in his car
Bill Hacker
Henry Gunning