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3.
Discussion of the Magnetic and Meteorological Observations Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845 Volume v.13 Art.5-7
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Discussion of the Magnetic and Meteorological Observations Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845
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