University of Pennsylvania. Department of Physics and Astronomy. University of Pennsylvania College of Arts and Sciences Department of Physics records, 1901-1953.

University of Pennsylvania. Department of Physics and Astronomy.

University of Pennsylvania College of Arts and Sciences Department of Physics records, 1901-1953.

University of Pennsylvania. Department of Physics and Astronomy.

AIP-ICOS

University of Pennsylvania. University Archives and Records Center Philadelphia, PA 19104-6320, USA