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Number of items: 1. Hale, George E. and Babcock, Harold D. (1915) An attempt to measure the free electricity in the sun's atmosphere. Proceedings of the National Academy of Sciences of the United States of America, 1 (3). pp. 123-127. ISSN 0027-8424. https://resolver.caltech.edu/CaltechAUTHORS:HALpnas15c |