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Richard C. Tolman and Albert Einstein at California Institute of Technology, Pasadena, 1932

Dormitory groundbreaking ceremony at Caltech, Pasadena, 1930

British journalist Sir Charles Igglesden with physicist Dr. Robert A. Millikan at California Institute of Technology, Pasadena, 1928

Lieutenant Colonel L. M. Adams and Captain H. R. Zimmer testing radium-atomite at Caltech, Pasadena, 1928