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Number of items: 1. Heppner, James P. (1954) A study of relationships between the aurora borealis and the geomagnetic disturbances caused by electric currents in the ionosphere. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/RWHG-0Y11. https://resolver.caltech.edu/CaltechETD:etd-12152003-111801 |