Secular variation of earth's magnetic force in United States and in some adjacent foreign countries, by Charles A. Schott, 8th edition; app. 1, report, 1895.
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Secular variation of earth's magnetic force in United States and in some adjacent foreign countries, by Charles A. Schott, 8th edition; app. 1, report, 1895.
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Secular variation of earth's magnetic force in United States and in some adjacent foreign countries, by Charles A. Schott, 8th edition; app. 1, report, 1895.