Philadelphia Central High School for Boys and Pennsylvania State Arsenal, 1839. This daguerreotype, created by Joseph Saxton, is the oldest known photograph taken in the United States. Image courtesy of the Historical Society of Pennsylvania.
Friday, September 28, 2007, 4:31 pm EDT
The McNeil Center for Early American Studies
Friday, September 28, 2007, 3:52 pm EDT
The McNeil Center for Early American Studies
Friday, September 28, 2007, 3:36 pm EDT
The McNeil Center for Early American Studies
Wednesday, September 26, 2007, 6:13 pm EDT
Barbara Bates Center for the Study of the History of Nursing, University of Pennsylvania
Tuesday, September 25, 2007, 5:00 pm EDT
Chemical Heritage Foundation, Brown Bag Lecture
Monday, September 24, 2007, 8:18 pm EDT
Department of History and Sociology of Science, University of Pennsylvania
Sunday, September 23, 2007, 2:06 pm EDT
University of Pennsylvania Museum of Archaeology and Anthropology
Friday, September 21, 2007, 12:00 am EDT
Hagley Museum and Library
Thursday, September 20, 2007, 5:00 pm EDT
The College of Physicians of Philadelphia
Thursday, September 20, 2007, 2:42 pm EDT
Philadelphia Area Seminar on the History of Mathematics (PASHoM)
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