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Comparison of curves of the declination magnetographs at Kew, Stonyhurst, Coimbra, Lisbon, Vienna, and St Petersburg
- "Comparison of curves of the declination magnetographs at Kew, Stonyhurst, Coimbra, Lisbon, Vienna, and St. Petersburg"
- "Comparison of curves of the declination magnetographs at Kew, Stonyhurst, Coimbra, Lisbon, Vienna, and St Petersburg"@en