University of Pennsylvania. Dept. of Astronomy. University of Pennsylvania College of Arts and Sciences Department of Astronomy records, 1839-1975

University of Pennsylvania. Dept. of Astronomy.

University of Pennsylvania College of Arts and Sciences Department of Astronomy records, 1839-1975

University of Pennsylvania. Dept. of Astronomy.

AIP-ICOS

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