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Presented is a list of voltages (electric potential differences) measured during magnetic storms on grounded long lines in the United States and Canada between 1891 and 1940. The sources for the list are published papers, technical documents, and newspapers. Each entry consists of the maximum voltage measured for each storm on a specified line connecting two ground points, nominally, between A "and" B. However, if a specific polarity is available, for example, the positive voltage from point A to point B, then the maximum voltage for the indicated polarity is listed, that is, positive A "to" B; conversely, for the opposite polarity, that is, from point B to point A, then the maximum voltage for the indicated polarity...