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Number of items: 1. Millikan, Robert A. and Cameron, G. Harvey (1931) A more accurate and more extended cosmic-ray ionization-depth curve, and the present evidence for atom-building. Physical Review, 37 (3). pp. 235-252. ISSN 0031-899X. https://resolver.caltech.edu/CaltechAUTHORS:MILpr31a |