Methods and Results: Secular Variation of the Magnetic Declination in the United States and at Some Foreign Stations; Appendix No. 12, Report for 1886 (Classic Reprint): Secular Variation of the Magnetic Declination in the United States and at Some Foreign Stations; Appendix No. 12, Report for 1886 (Classic Reprint)
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Methods and Results: Secular Variation of the Magnetic Declination in the United States and at Some Foreign Stations; Appendix No. 12, Report for 1886 (Classic Reprint): Secular Variation of the Magnetic Declination in the United States and at Some Foreign Stations; Appendix No. 12, Report for 1886 (Classic Reprint)
