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Number of items: 1. Millikan, R. A. and Neher, H. V. (1939) New evidence for a change with time of the total energy brought into the earth by cosmic rays. Physical Review, 56 (6). pp. 491-493. ISSN 0031-899X. doi:10.1103/PhysRev.56.491. https://resolver.caltech.edu/CaltechAUTHORS:MILpr39b |