Discussion of the Magnetic and Meteorological Observations Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and

Discussion of the Magnetic and Meteorological Observations Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and - A. D. 1806-1867 Bache