"Construction of the Pennsylvania Ave. Subway, Philadelphia" Lantern slide used to illustrate an Engineering course on Railroads delivered by Samuel Tobias Wagner from 1895-1909 at the Wagner Free Institute of Science.
Tuesday, April 16, 2013, 5:00 pm EDT
Chemical Heritage Foundation, Brown Bag Lecture
Monday, April 15, 2013, 8:30 pm EDT
Department of the History and Sociology of Science, University of Pennsylvania
Thursday, April 11, 2013, 11:30 pm EDT
Hagley Museum and Library
Thursday, April 11, 2013, 8:00 pm EDT
Johns Hopkins Program in the History of Science, Medicine and Technology
Wednesday, April 10, 2013, 5:00 pm EDT
Barbara Bates Center, University of Pennsylvania
Tuesday, April 9, 2013, 5:00 pm EDT
Chemical Heritage Foundation, Brown Bag Lecture
Tuesday, April 9, 2013, 4:00 pm EDT
Monday, April 8, 2013, 8:30 pm EDT
Department of the History and Sociology of Science, University of Pennsylvania
Thursday, April 4, 2013, 8:00 pm EDT
Johns Hopkins Program in the History of Science, Medicine and Technology
Tuesday, April 2, 2013, 11:30 pm EDT
The College of Physicians of Philadelphia
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