EPH's secretary writes to L. P. Eisenhart of the American Philosophical Society, letting him know that EPH will be glad to deliver the R.A.F. Penrose Memorial Lecture.
If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.
Share your story
Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.