Description Includes letters to Speigelberg from: P. Ansgar Paus, OSB Gerleve, Germany(?); Sir K. R. Popper, The London School of Economics and Political Science, University of London; Richard H. Popkin, Editor, Journal of the History of Philosophy, Department of Philosophy, University of California, San Diego; Richard Palmer, Director of Humanities, MacMurray College, Jacksonville, Illinois; Ivor Pieydan Pearce, Department of Philosophy, University of Bristol; Ralph Barton Perry, Department of...