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Heppner, James Paul (1954) A Study of the 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

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