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Number of items: 1. Epstein, Paul S. (1930) Note on the nature of cosmic rays. Proceedings of the National Academy of Sciences of the United States of America, 16 (10). pp. 658-663. ISSN 0027-8424. doi:10.1073/pnas.16.10.658. https://resolver.caltech.edu/CaltechAUTHORS:EPSpnas30b |