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Two earlier articles published in the December 6 and December 27, 1994, issues of Eos outlined the history of solar-terrestrial research from Sabine's founding discovery in 1852 through Chapman and Ferraro's landmark paper in 1931. This article deals with the development of the field from 1930 to the present with a focus on the identification of the solar sources of the two basic types of geomagnetic storms: recurrent and sporadic.