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Number of items: 1. Millikan, R. A. and Cameron, G. H. (1928) New precision in cosmic ray measurements; Yielding extension of spectrum and indications of bands. Physical Review, 31 (6). pp. 921-930. ISSN 0031-899X. doi:10.1103/PhysRev.31.921. https://resolver.caltech.edu/CaltechAUTHORS:MILpr28c |