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Number of items: 1. Millikan, Robert A. and Neher, H. V. and Pickering, W. H. (1947) Primary Cosmic-Ray Protons and the Atom-Annihilation Hypothesis. Physical Review, 72 (6). p. 513. ISSN 0031-899X. https://resolver.caltech.edu/CaltechAUTHORS:MILpr47 |